I don't know what those things are but some might be on YouTube as well. But since free usually translates to piracy or illegal, I'd rather buy physical copies. Quality on those kinds of sites probably isn't always great (it usually isn't great on YouTube) and I seriously don't need any more run-ins with law enforcement. But yes, a lot of things once considered rare are suddenly getting released. Open House has not yet had a DVD or Blu ray release and the one I got is an obvious bootleg, but I do already have a factory-made VHS so that one might not land me in as much trouble if anyone were to find out.

I checked out Tubi and you're right, it has a huge horror selection. Lots of newer stuff and not so much older (at least that I saw) but plenty that looked interesting. Some of the older classics are there, but not so much of the 80s stuff. I watched Terror Birds and it did indeed look like hi definition. Amazing that you can use it without an account. It seems everything everywhere these days makes you have an account and submit personal information. Ads are a bit annoying but that's a small trade-off for it being free and not having to have an account. I'm betting a lot of the stuff on there is obscure, even the newer stuff. Treehouse and Shrooms are on there, and I wouldn't even imagine anyone bothering with those. They are probably considered obscure.