Yeah.
Most kickboxers don't utilize it because they're fighting other competent kickers though. It's the easiest kick to check because you don't even need to raise your leg.
Guys in the UFC get away with it because: 1) there's not a ton of great kickers - even the ones that can kick well aren't exactly nuanced in any aspect other than offense (of course there are exceptions, just saying it's not the norm) 2) MMA fighting is always a bit chaotic with the allowance of all forms, so you can catch people off guard.