There’s some honest to goodness swearing on the new streaming Star Trek shows. Their highest concentration is probably on Discovery. The dialog’s written a little differently on the show, and their go-to scene establishing shot on the bridge is three scientists giving very Star Trek comments, and a fourth person earnestly going, “Holy shit this is so cool / extremely dangerous.”
The other shows have a slightly more classic tone, but even Patrick Stewart got an f-bomb off in the third season of Picard. The shows mostly limit it to one-off expletives during firefights. They’re rare enough that you typically don’t even catch them when they come up. They definitely don’t have extended colorful metaphors like “cock-sucker” though. At that point they’ll reach for a sci-fi comment like the Trek film’s “pointy-eared bastard”.
Personally I like the joke someone made a while back about how swearing on Star Trek is a setting the captain gets to make on the universal translator. Picard’s a narc, and Pike’s the cool boss.