1. "the FOSS community shouldered the burden – both with our labor and our wallets – of a massive exodus onto our volunteer-operated servers" -- this implies that users actually using decentralized services is a burden, a bad thing. Or rather, that a) it would be much better if Twitter was better and people just continued using Twitter rather than FOSS platforms b) that Twitter has some kind of obligation to keep their platform good because not doing so will make people use FOSS services. If the operators don't want their service to be used, they don't have to offer it...
2. "No billionaires" as a motto, implying that having money in itself (and not a specific way of behaving) is wrong, unethical, and worthy of exclusion. That feels like an very common envy-based position, trying to tear people down because they are better off. He does have reasonable points for not wanting that specific billionaire, but the demand for exclusion is "no billionaires". Should e.g. https://en.wikipedia.org/wiki/Brian_Acton not be allowed/given a platform at FOSDEM?