Let's put it this way, on the steam survey, Ubuntu is the second most popular distro. The first is Arch, (from the steam deck, I think.) But even if you don't count arch, all the other distros put together are almost twice the amount of users as Ubuntu.
https://store.steampowered.com/hwsurvey/?platform=combined
Another possibly imperfect place for us to look is the Gaming On Linux Stats: https://www.gamingonlinux.com/users/statistics/
Those stats seems to suggest that while Ubuntu based distros are the most popular, Ubuntu is only slightly higher than Pop!_OS or Linux Mint, and both of those Operating systems get rid of snap. In fact, I used to use Ubuntu, and it's still my go to operating system, but the first thing I do is ditch snap. I'm sure a lot of other Ubuntu users do likewise.
So yes, technically Ubuntu is the most popular distro, there still are more people using Fedora/Arch/OpenSuse/etc than Ubuntu.