Tarot cards were borrowed from friends before they were opened. Is it still valid?

It depends on your communication with tarot cards, but as a qualified tarot player, you should not let your friends open your cards.

Tarot cards have just chosen a spirit. I guess your friend didn't choose it, but the job is still yours. However, the relationship between your present situation and tarot cards is not innate. It can only be cultivated later. Of course, if it is not cultivated, no one can blame it. (personal opinion, don't mind. As for the card seal, it is old-fashioned, or it can't be used for other reasons. You are so useless. ..