> Do you think kids wouldn't develop the same mental health issues if they were on Mastodon instead of Facebook?

I'm not sure, but Facebook has employed too many PhDs to name with the goal of fostering addiction to their product, as well as behavioral ad targeting, and to my knowledge, Mastadon has not.

> Do you think the largest Mastodon instances wouldn't start also harming their users once large enough?

I don't think user harm is correlated with size of the platform.

> There's nothing preventing the decentralized from becoming centralized over time, from the same network effects, and abusing the users all over again.

Which is why I support things like the AT Protocol, which enable decentralized social networks that can share data amongst each other, and permit users greater control over what they see and from where.

> In which case, why fight for it?

Because I've been fighting for a better internet for decades at this point and see nothing better to do with that time were I to stop.