My mind was blown recently discovering Tubi with so many great movies (many of them classics and highly rated) for free (with occasional ads, of course) and I regret having paid for Netflix and other services in the past.
As an aside, the ad format (forced ~2 minutes of ads every ~20 minutes) is way more tolerable than something like YouTube (Skip button roulette every ~5 minutes). I can mute the TV, use the bathroom, make a snack, just like the good old days.