which one of those aren't on TikTok?
Shadiversity for example produces content that you would think fits tiktok, but he gets an order of magnitude more views and subscribers on youtube than tiktok. Same goes for the other channels I checked. It makes sense for them to upload on tiktok as well since it is cheap to hire an editor for it, but I don't see them focusing on tiktok since the market for tiktok nerd videos seems to be much smaller.
If you look at channels that are a bit smaller, like half a million subscribers, they don't seem to even bother with tiktok, don't think it is worth it then to even have an editor fix it for that format.
So to me this looks a lot like "nerds aren't on tiktok", sure some big channels also uploads there but it doesn't look like they consume tiktok content.
If someone like marcus hutchins can get a half million followers or cryptoknight can get a million likes, there must be a significant number of consumers for their content.
The gender skew on steam is larger, but not much larger, and that is enough that you basically don't want to release on steam with a game made for women, instead you target mobile or similar because your target demographic basically isn't found at steam.
That maybe what you're discussing but I made no such claim. The two examples I used aren't even youtubers. Cryptoknight only post on TikTok and Marcus only has 88k subs on YouTube compared to his almost half million on TikTok. Professional YouTubers will never migrate from YouTube to TikTok, its impossible to make a living with TikTok's creator fund.
Your FYP must be very different than my mine. My FYP is filled with 30+ male nerds, many of whom have entire rooms dedicated to TMNT toys.