I’m against pet feeders in general.

Cats regulate themselves much better than us, they don’t need us “measuring” food, just check they have dry food available 24/7 and manually give wet food. If you can’t dedicate a few minutes every day to check for their needs, you may need to reconsider keeping them.

Unless they have health issues, in that case a pet feeder could be handy, but it’s hard to believe they are “millions”.

Dogs don’t need to eat as often as cats, if you “need” to feed them remotely, it means you’re leaving them alone for very long hours, that’s not good for a dog.

You can safely leave a cat alone all day if you’re out working, not a dog.