Certifications are moot. I don't care if you are certified, or if you have used a cloud (or kubernetes) following a tutorial. I do care if you have seen enough issues throughout your career, so you can debug every time (not when, nor if) mud hits the fan. I don't care if you can type a port in a yaml file or in your browser. I do care if you know how many ports are there, what's the ephemeral port range and so on. Systems are 75% experience, 25% basic knowledge, you can't get away just with certifications which matter only after you get experience and knowledge.
If you are experienced in ops, I know you can learn and work out any cloud. If you claim you are experienced with a specific cloud though, then better have to share a ton of war stories or it will just be a huge red flag on your CV.
Let's call it for what it is, clouds, like data-science are hot fields right now. It's only natural that many people will go after a good-paying job claiming expertise in the field.