That hardly seems fair. For 99.99% of users everything they do on the site is publically available. There is no private messaging, no private anything. The entire history of everything on all sites being public is one of the explicit goals of the site. So "sharing with 3rd parties" means absolutely nothing. Those 3rd parties could scrape the site or they could download the archive.

https://archive.org/details/stackexchange

It doesn't seem like they should be marked as having a poor TOS for at least half the things listed as those things are basically the known purpose of the site.