It’s certainly true that people are more open about FOSS on Nostr but also that’s the kind of theme that will get shadow banned on X. So hard to do apple to apple comparison.
Discussion
Apple to apple comparisons are boring anyway 😂🙈. I think there is a barrier of entry when switching from mainstream networks to non-mainstream. Thus people who do the switch early and take that initial "risk", are more likely to show anti-swarm behaviour. I assume the larger the network grows, the lesser the barrier of entry, the larger the swarm behaviour (popularity contest).
But yeah, you are right about the algorithm / shadow-banning, those do the rest to enforce monopolies and suppress new ideas on mainstream networks 🙈..