@si_irini
You really ought to read #TimChambers article again.
Massive data extraction through #screenscraping has been happening for years:
https://mastodon.social/@HistoPol/111575306870943698
The only real defense is complete anonymity and deleting old posts after a week or so (the latter being unacceptable to me.)
Someone has been creating a meta-searchendine for the #Fediverse. He respects #nobots (and something else.)
Don't recall the name @ present.