I wouldn’t say even more just because of the conditions that were present when Spanish flu touched down.
It started on a Kansas farm according to accounts and really spread at an overcrowded army barrack in Kansas. Then those soldiers went to war spreading it to other soldiers on ships and living in extremely close quarters with others eating, pissing and shytting in the same ditches they were sleeping in on the battlefields.
Even though we live in densely populated areas all over the globe, communal outhouses and water spouts are mostly a thing of the past. These people from back then we renting out beds for 6-8hrs at a time to sleep before heading back to work. That’s a steady rotation of people sleeping on the same dirty sheets day after day.