Imho same thing like with sales, gotta look at ccu having budget of a game in mind, outer worlds 2 is AAA but its not some crazy big budget AAA (like cod, mainline entry of assasins creed, battlefield and such)so if it hits 100k ccu i will consider it major success, 50k ccu will be somewhat decent/break even territory, anything below that will be a flop.
And yes, i take into account game being "free" on gamepass, lets not forget starfield did 330k ccu while being on gamepass too(and its even same/similar genre too).
Games from genres pc gamers love/are hyped for can get decent ccu on steam despite being on gamepass, fh5 had 81k peak ccu, last 24h peak ccu is still above 18k, and thats almost 4 years after launch .