Dave Portnoy's not sorry to see Stephen Colbert's show ending ... pointing out this is just capitalism at work -- lose millions, find a new job!
The Barstool Sports founder took to X Saturday to fire off about CBS' cancelation of "The Late Show with Stephen Colbert" ... calling out Senators Elizabeth Warren and Bernie Sanders -- among others -- for claiming Paramount was politically motivated to give him the axe.
ICYMI ... Colbert went after his own network in his monologue early this week -- likening a $16 million lawsuit settlement over a "60 Minutes" interview President Donald Trump claimed was deceptively edited to a "big, fat bribe.