Google Drive with hundreds (thousands?) of movies sorted by categories, Hollywood, Arthouse, Indie/Cult. Been using it since 2020 to watch stuff that’s almost impossible to find anywhere else. The drive is on the website I linked but theres also instructions to watch via Plex if you google it.
Other than that Internet Archive has a bunch of movies, Kanopy requires a library card but has new stuff and old stuff. Just googling “watch ____ online free” still works if you’re brave and pure of heart.