My broader point is that you can replace that scenario with just about any subgroup with an extremist representation and it holds. Incels are a prime example. QAnon too. The list goes on. The people who end up extreme in those viewpoints don't start there, they get taken on a journey to there though lots of very marginal successive influences.
A social media algorithm is purpose-built to achieve that because it turns out that is the exact same pattern as 'you hovered over a cute cat video once, so we guess you like cats, so we're going tto bombard you with cute cat vids to drive up your engagement'.