Corporations are neither evil nor nice. They are indifferent. By design they only care about money, they don’t care about anything else.

Hashing only works if the website stores their passwords correctly. If a single website you use doesn’t hash passwords correctly, and gets their database leaked, then your passwords will all be leaked. Changing a few characters per site may help a bit, but it shouldn’t be relied on.

Also, if you’re worried about the host shutting down, you should try bitwarden. It’s completely open source, and you can self host it if you want.

The problem is that no one can compete with YouTube. YouTube offers free 8k video hosting for everyone. And you have a relatively small number of ads. It’s basically impossible for any other video hosting service to provide this all for free.

You would absolutely get DMCA takedowns. YouTube’s system is designed to allow copyrighted content without getting it completely removed.