That isn't true. I have a PornHub subscription that uses bitcoin. There's nothing speculative about it and it's completely legitimate. I've also used to to purchase indie games instead of giving Steam/Google/Apple/Epic a cut. I'm looking for a Spotify alternative and this seems to fit the bill and I'd give OP some bitcoin to check it out.

Just because viable usecases don't exist today isn't proof that they'll never exist and isn't a reason to stop development. If we gave up on hard problems because we didn't solve them in 15 years we wouldn't have the AI we have today.