I have had my indoor cats get out before, it sucks. I currently have AirTags on their collars but something like this with real gps would be way better.
3/4 of mine have collars with RFID tags on them to control how much food they get from the automated feeder. They didn't care for them too much at first, but they quickly learned that it was their meal ticket.
The fourth cat doesn't have one because she can't eat kibble without it causing urinary problems.
Ours didn’t used to, but when we hired someone to watch them while on vacation we realized it was a good idea. They could get out due to carelessness, or a broken window screen. They could also end up out and alone in the confusion of something like a house fire.
A lot of people with indoor cats also leash train them.
I just wish it were smaller.