Greentext was removed from Soapbox (in general) because it was copied from Pleroma FE and proven to be vulnerable to XSS attacks. Some Soapbox servers on the Fediverse put it back because they don't care, I guess? lol

To answer your second question, we're still ensuring Soapbox maintains compatibility with the Fediverse for anyone who wants to keep using it. That being said, the primary focus now is Nostr and all of the new features and improvements we're making are primarily for Nostr.