In my head cannon I look at Omega mutants and humans a bit different. Not as people whose powers have no upper limit. Bit as people who with the use of their powers can very much alter or change the world for the good or bad. So Yes they can be stopped but if left unchecked they would be gods on Earth. I mean even Omega level mutants can and have been stopped in the past.
So looking at my head cannon I have a few that I mentioned before Like Doom, Richards (not because he can stretch But because he can create anything out of a tooth pick and napkin.), Stark. Electro would damn sure be one. His electrical powers he can destroy power grids and be a huge threat. Doctor Strange can use his magic to mess things up. Sentry and Hulk on a rampage. Even Mole Man could fit in. he always has machines that cause earthquakes and tries to throw Earth off its axis. Then there is Graviton. I know Forge is a mutant but he can create any machine that would be needed to neutralize anyone's powers, even Omega level characters or copy them. Doctor Strange can open a gateway to other realms with magic? Forge can so the same with a machine. Magneto can cause the Earth's magnetic fields to go nuts? Forge can do the same thing. So that makes him as strong as any Omega to me. Just because it is not done naturally does not make him any less of a threat or any less powerful.
I mean if Reed and Stark sat down in a room they could solve all of the worlds problems. Energy crisis, hunger, weather manipulating satellites etc... They have the power to change the world in the blink of an eye. So yea Omega level.
Those are my thoughts. I know there will be much disagreement but that is why I called it my head cannon.
This Post Contains No Artificial Intelligence. It Contains No Human Intelligence Either.
If that's the case, then someone should walk both out to the edge of existence and throw them off as punishment for not solving all of the world's problems. They have utterly failed as heroes and basic human beings. Especially since there are so many heroes around to protect and raise their loved ones, bed their wives, explore the unknown, address global and omniverse-wide threats, etc., i.e, Reed's and Tony's usual excuses for not saving the planet.