Are chicken feet healthy food?

No, eating too much is not good, and pickling outside is even more unsanitary. It's ok to eat occasionally. I suggest you eat less, or try to cook it yourself. Buy chicken feet first, wash them when you come back, then marinate them with wine and sugar for an hour, and then put a little oil, pepper, star anise, pepper and some spices in the pot. Remember to add water to boil for a while, then add black soy sauce.