I highly recommend the website "youtube.com" there's a lot of content on there that's excellent. I am never for want of something to watch, it sort of seems like an absolute golden age of content production to me.
I'm trying to watch long form cinematic content, not a 10 minute diy video for turning my toaster into a flamethrower with three minutes of ads and "smash that like button" interspersed.
There wre a few YouTube channels I like but they are all educational where one guy talks to the camera about a thing. Is there decent fiction on YouTube? I haven't seen any.
Get adblock and sponsorblock, or just yt-dlp it and let it cut out all the cruft, watching youtube with the callouts and sponsor segements left in sucks but we have the technology to solve the problem. I would believe there's good long form fiction content, I've listened to fiction podcasts with sound effects so there's at least that. I mostly watch multiple hour long non-fiction content so there's definitely lots of long form available, but I'm not sure how much fiction there is.
I think that's more of an issue of discovery. If I wanted decent fiction, I would actually prefer Apple's catalogue of Sci-Fi shows over anything I can find on Netflix these days. While with Youtube, you can find hidden gems outside their algorithm. In fact, I'd recommend not abiding by the algorithm of any platform and seek outside sources for finding shows you'd enjoy. Each platform has the same goal to retain your attention.
The lengths vary, and the channel only recently started their own first-party content production (rather than licensed third-party content), but that being said, the sci-fi channel DUST is a longtime favorite of mine for fiction on YouTube. The quality level is consistently high, if not quite Hollywood budget.