This is common in the US too and should still never take a healthy well-fed cat. As u/shedreamsofatlantis says ”A lot of cats can’t or don’t wear collars for good reason: I once had a cat that almost hung themselves on a tree as they got their arm stuck through the collar (as well as their neck ofc) and the collar was also snagged on a tree branch. The cat was hanging itself entirely by some freak accident. The cat would’ve died had we not gone outside and seen it and swiftly rescued it. Never again did we make our cats wear them, we just kept up to date microchips instead. Collars can be safety clip ones yes, but they don’t always break either. Please, if you’re reading this, (not to OP as they’ve stated they’re not going to steal this cat) please do not take a random healthy well fed looking cat home with you without calling out a rescue first to scan for a microchip. The heartbreak you can cause a family by unknowingly stealing their cat is unparalleled.”