Earlier quoted context omitted.
There's no algorithmic advertising, no universal tracking, and your instance's mod team is known to you instead of a faceless automation farm.
Are there no fediverse-scraping services that sell your data to advertisers? That seems a prime target for every moderately-evil adtech executive out there.
Even if there are, they still get a lot less data since they only see what you posted publicly. Unlike Twitter/Facebook, scrapers won't see your every mouse movement, how long you stare at any individual post, or any other of the more invasive tracking opportunities that are available to Twitter/Facebook.
The scraping services also won't know your email address unless you post it publicly or they figure it out some other way, so they'll find it much harder to associate the data they scrape with your other online identities, too. This also makes the data less valuable to advertisers, so I imagine there's less incentive to scrape it.