Dudes... problem here is pop is used to mean more than one thing. Pop music has a specific meaning as a musical genre. There is no debate to this. Its been documented by multiple sources for multiple decades.
Lets take it away from Hip Hop because i think folks sensibilities are being clouded.
We are in america, Country music is immensely popular. Country music stars routinely outsell the majority of pop stars. Country music does NOT get play on pop music channels. Even an artist who was an established Country artist like Taylor Swift, who had legit country hits had to change to a pop style to get pop play. Pop music doesnt mean music that is popular. Pop music takes elements from many styles including country, but it also explicitly cuts off the most distinguishing key elements of the source music to get a style that is palatable across the boards. In regards to Country that means stripping away number one the strong southern accent. When Taylor Swift hits 28 and is re marketed to her country roots, the first thing you gonna notice is the southern accent is going to be back. Number two is stripping out the 7th chords to majors except maybe dominant 7ths. It means changing instrumentation. Removing extensive guitar vamps. Downplaying the specificity of the narratives to more generically appealing approach... country music characteristic is its specificity in its story telling...
Thats what pop is... its not just ohh a song is popular so its pop... thats why country hits dont get play on pop charts... because country music for all its popularity is a hate it or love it affair. Pop music is about the broadest possible accessibility i e the lowest common denominator of elements.
Another non Hip Hop angle is Adult Contemporary R&B. That doesnt really mean R&B for old folks, it doesnt mean old school R&B it is a specific genre...
Some Adult Contemporary R&B songs are wildly popular. Adult Contemporary R&B singles dont outsell pop stars singles, but their album sales can sometimes outsell pop albums sales. This is a popular music form. This music doesn't play on pop radio channels even if the song in question in question is a hit popular record.
Another non Hip Hop angle is Rock. Which is the MOST ICONIC and historically has been the most popular music form in america.
Whats the last rock song that was a hit on Pop radio? Yet these dudes are selling albums... Selling out tours... BUT they wont get pop airplay... the whole pop music genre was specifically designed to be 'rock' without all the edges...
This is not even debatable... pop music is a specific genre... it evolves over time... but it is a specific genre...
let me try once again to explain pop, but let me take hip hop out of it so we dont have a debate ...
say you have a world where the most popular genres are Country, R&B, Dance and Rock. HOWEVER the important thing is there isnt just attraction to music, there is repulsion as well... Lets say that R&B heads hate Rock and Country. Country heads hate Dance and R&B. Etc... say each audience has 50 million people in it... at anyone one point in the time the most popular best selling product might be a Country or R&B or Dance or Rock song and it might get 50 million in sales... But how do you have a radio station of these popular hits... it will play the most popular rock song, then the most popular R&B, then the most popular Dance, then the most popular Country. But no one will listen to it, they will turn the channel as soon as a genre they don't like comes on... so instead another strategy is what if i focus on making a new genre where i take the elements from each, but i remove the most unique easily identifiable components that are repulsors to other genra audience. Take the accents out of southern, take the distorted guitars out of rock, take the 8 minute length out of Dance add in choruses, take the blackness out of R&B... now you have a genre that no audience hates, no audience loves 100% but can get 25% share from each audience... you can make a radio station for this genre now, you can market it now... and since you can market it across the board to 100% of people over time this genre gets more popular...
and that is LITERALLY what pop music is... Country, R&B, Rock merged in 60s... in the 70s it merged in Dance (Disco)... at the turn of the millennium Hip Hop was merged in... its a distinct genre all its own even though it contains a lot of components from all over the place... its founding principal is sales by way of not OFFENDING musical sensibilities... its literally the venn diagram union of 'like' across the american public...
Sometimes a true rock country r&b or hip hop song can get wildly popular... and depending on how many repulsors it has it can sometimes get play on pop radio... that doesnt make it a pop song... that makes it a crossover...
this isnt my opinion. this is literal documented... rephrase... WELL documented fact.