When a dog is a puppy the biting of people playfully is a natural and normal thing but the puppy biting should be stopped as soon as possible.
Because if you continue to allow the puppy to bite you then you're reinforcing that behavior and then the puppy may not stop biting people the older it gets.
You can use a spray bottle with some water and spray the puppy when it starts to bite you and tell the puppy that they shouldn't bite and tell them in a stern voice.
Eventually the puppy will stop biting you when you just grab the spray bottle and they should also eventually stop biting you as they learn and grow up.