Cats may bite people's feet because they think it's a game, or because they want to attract your attention. Sometimes cats will bite people's feet to express their needs, such as when they are hungry, want to play, or want to be talked to.
If you don't want your cat to bite your feet, you can try to provide them with other options, such as giving them a toy or giving them a toy. They provide additional cleaning tools so they can play and clean themselves elsewhere. You can also train them to use a sound or gesture to say "no" to them when they start to bite your feet. Of course, it's also possible that cats bite people's feet because they have a medical condition, such as dental and oral health problems or other health reasons. If you notice your cat is behaving strangely, it is recommended that you take it to the vet.