At the end of the day the people who are going to spend the most time online and post the most about their grievances are the right. They were able to turn youtube’s algorithm into an alt-right pipeline for the same reason.

The right taking over yt is at least partially due to their largest channels all being vocally aligned with corporate interests and receiving tons of funding in return. Shapiro, Crowder, PragerU, Peterson and so on and so on, they're all on the payroll of Texas oil money as they're vocal climate change deniers (or, in Kermit's case, climate deniers). The fash turn of :reddit-logo: is likewise propagated by corporate donors and federal agitprop squads. r/neoliberal is a PPI pet project, the rampant sinophobia is heavily astroturfed etc., reddit's head of policy has CIA links etc. etc.

The fact that there's a bunch of terminally online fash weirdos as well doesn't make these takeovers organic. Successful PR always utilizes people like that as multipliers, but no rightwing movement succeeds on its own accord. This has always been a result of the ruling class propping the fascists up either deliberately or neglectfully.