Incorrect, considering that they were relatively unknown prior to being in the MCU. That's what happens when you're the largest video entertainment franchise in the world.
Exceptions do not make the rule. That's why they're "outliers".
It has happened. Tom Holland, Chadwick Boseman, and Simu Liu (Shang-Chi) were in literally a handful of things prior to the MCU. They're in it going-forward.
If they say they're gonna pay villains > protagonists, then I'm gonna take their word for it. History shows that they've already set that trend and precedent. There's also less ego to deal with (see: Norton).