Expected outcome. Vast majority of the player base is male. Can't be bothered to do research, but that seems plausible. A large portion of male players that like romance and wholesome are probably into self inserting as a male protag to get that feels. So that leaves corruption enjoyers who will make up a large portion of players that are willing to play fem protag.
This sounds like a pretty plausible theory for a lot of vanilla/dom leaning males, and even some subs, as I know a couple users in the femdom community who just don't play any lezdom games because they can't enjoy female protag stories...
That said, I for one am the complete opposite, in that I only like male protag games if they are femdom and at least somewhat torture/humiliate their MC, and while I also voted for corruption and manipulation because I'm a kinky degenerate and I prefer lezdom games to wholesome yuri ones
, (too "vanilla" romances that don't explore uneven relationship power dynamics tend to bore me if the story is not otherwise remarkable) I'll still always take a wholesome female protag yuri game over anything with a male protag that's not femdom!
Tbf it's a poll with just three options at the end of the day, so you can't really draw much of a conclusion from the results, as many voters will have had unique/unorthodox reasons for their pick, but I can easily imagine a lot of male dominant/vanilla players (maybe even some switches) doing exactly what you said.