Everything from self driving, to shipping cars, to moon and Mars missions. It's one thing to be an optimist. It's another to promise something you have no path to deliver.
Musk said he'd be launching a mission to Mars every possible window starting 2024. Including manned missions. I believe he was going to send an experimental mission to Mars before that.
My point isn't that these companies don't get there, it's that they take much, much, much longer than estimated.
The first one won’t be crewed, and there’s no way that’s going to be ready by 2022. So 2024 will be unmanned. Maybe 2026 will be the first crewed test mission, but 2028 is more likely. But we’re still talking aspirational Elon-time. If I were betting money, I’d say the 2030’s is more realistic.
Note that they have done zero work on building a anything other than the rocket body to get there. Making the interior volume habitable for 2 years of interplanetary travel is going to be non-trivial.