Last week's episode had over 5K seeders when it came out on Thursday at one of the most popular tv/movie torrent sites that isn't PirateBay. That is around the Peacemake figures. Also 4 times as much as what the DC CW shows are getting.
Plus it's already been renewed for season 5.
CW comes with most satellite and cable packages and is free to stream, so it makes sense that few people are pirating CW shows. STD is only on Paramount+, a paid streaming service which few people have, so it's no surprise that that show is being pirated a lot. I wouldn't use that as a measure of success or even popularity. People generally pirate things when they don't care enough to pay for and support them.
Historically, Paramount's stock price has roughly mirrored the success of Star Trek. For example, it peaked around 2000, then went down until it hit rock bottom in early 2009, then skyrocketed until it peaked again in 2016. Since STD's premiere in September 2017, though, the stock has lost over half of its value (and lost it
before COVID hit). That doesn't look like much of a success, but STD is one of the few series that Paramount has to promote their streaming service with, so it's no surprise that it keeps getting renewed, anyways.
