I already get a free year of PP Essentials Edition courtesy of T-Mobile. It is the version with ads

It's not as bad as the ads on Hulu, but that was a low bar to clear. At least here, I can queue up 2 ads back-to-back by fast forwarding to the point just after the 2nd unwatched ad. Unlike Hulu, PP doesn't make me re-watch ads I've already seen (in the same session)!

They're still awful overall that the time I've spent on PP has been very minimal. I've ended up watching some documentary about the US Navy SEALS (no ads here!), and filling in the missing episodes of
Corporate, and
Reno 911. I want to catch up on some of the stuff here, but it's gotta be ad-free. I won't renew when the sub is up. Instead, I'll come back and do ad-free at a later time next year.
Nobody wants this. Many of us are already paying for more streaming services than we'd like to and this is just one too many. And Paramount, while it's a familiar name, does not have the same cachet as Disney, HBO or even Apple IMO. Most people can name at least 1 show or movie (probably more) made by the first two. Can you name anything that Paramount has done off the top of your head? I can't.
I rotate SS (streaming services). For me, time is the bottleneck. Even bundling Disney+ and Hulu together to save $1 a month is wasteful when either of them have enough content to keep me occupied month in, month out.
As for your question, I have dabbled in Paramount Plus so became familiar with their catalog. Prior to that, I knew for sure that many of the CBS stuff was on there. So the various Star Treks, various CSIs, and their prime time line ups like NCIS, and Seal Team. I got word that Seal Team left CBS.com to become a PP exclusive (so people couldn't even watch it for free anymore, without a sub).
Personally, I was even more clueless about ATV+ prior to redeeming my free trial. I knew there was a "Tom Hanks movie" (basically,
Greyhound), and another TV series b/c they were advertised elsewhere (YouTube, Amazon Prime, or probably some webpage side browser?). Starz... I couldn't name anything they had on their SS even if my life depended on it!
Not if you like Star Trek.
A year+ ago, it was nice when Amazon Prime had TOS, TNG, DS9, and VYG on there!