One of the things I like about Fedi/Mastodon is that it's a social media platform where the main beneficiaries of my parawork on the platform are the other users of the network.
If I put my writings out on a more mainstream social media platform, then they'd be heavily exploited for financial gain of large companies.
I mean, I'm sure they're scraping this for their own gain anyway (and of course Facebook has Threads to exploit Fedi), but my parawork is not ONLY supporting a closed platform.