Licensing is a no-go. There’s no way Paramount would sell any iota of the Star Trek IP for movies or TV shows.

You might not be aware of the fan film fiasco, but essentially back in the day people used to be able to do all kinds of cool things including bringing in Trek alumni actors to play parts in their fan films until a man named Alec Peters went a few steps too far. Initially the main complaint was that he was using the Star Trek IP to essentially launch his own competing studio, but he did some boneheaded things like illegally selling branded Star Trek merch. Guy was literally selling Axanar coffee at one point. He was taken to court and Paramount released an entirely new massively restrictive rule set for any fan project, shutting down those not in compliance.

The only way you’re going to get access to this content is through piracy. That’s the only universal answer to when studios randomly scrub things off their platforms.

I remember when Netflix just started up and we were fresh off the end of ENT. Doug Drexler and a lot of the crew were trying to see if they could get Paramount to let Netflix do a final s5 for ENT, and it went absolutely nowhere but it was a nice little hype train for a while wishing that I could see the Romulan war.