Indeed shitty privacy contrats and dataminig are too
Have you read the privacy contract ?
Because you should
https://mastodon.social/terms
See the fedivers for hundreds of instances of gnu social (what mastodon runs on)
http://www.fediverse.org/
If you want to install one on your server here's the manual
https://karp.id.au/social/en/admin/index.html
Beware of datamining
https://media.ccc.de/v/33c3-8414-corporate_surveillance_digital_tracking_big_data_privacy