Vimeo is the only one in that list I've even heard of

There are no meaningful competitors to YouTube in most markets, that includes Vimeo.

Google search has competitors too, none that are large or threatening enough to influence Google's product behavior around search. That's the key when it comes to competition. If a competitor is so small you can safely ignore them, they're a competitor in name only.

The only potential threat to YouTube in the near-term, is Facebook's watch product.

Twitch.

> Vid.me

Unfortunately, simply cloning youtube isn't a competitor without also cloning youtube's bankroll. For a very good explanation of why, see Folding Ideas video essay "VidMe or Why Platforms Aren't Your Friends"[1].

[1] https://www.youtube.com/watch?v=r3snVCRo_bI

Dailymotion