I have a tarot deck, and have never charged for a reading.
I look it at like every card has a set meaning. The querant ("one who seeks"), asks a question or imagines an issue, picks their cards and puts them in a position that means something (past, present, future for example). Someone then tells the querent what the cards mean, or they look it up. They then reflect on their lives, and if anything they were told resonates or makes sense.
I started using them as a tool to explore my feelings, some aspects wouldn't be as applicable, others would make me think. Like astrology, I saw it as a fun "thoughts for the day" type experience, with just enough general universal truth per card, to make some aspect apply to most people.
The more I read the cards for myself and others though, the more I've realised they defy statistics. They really do, there are still cards relatives of mine pull all the time (pre-covid anyway), that I've never pulled myself. I've noticed a pattern in the sorts of cards various querents pull. A certain relative, plagued by debt gets the 6 of pentacles reversed quite often, another battling personal demons often pulls the devil. When I was in an abusive relationship, I pulled a lot of sword cards, and I've pulled the tower before, in the future position, and thought "oh no", then something quite drastic has happened.
There is something uncanny about them. A lot of relatives have refused readings, but I ask about them myself anyway, (usually when trying to get some insight, into how someone else might feel). Reading warned on several occasions at one point, not to let DS get too isolated, and that made me think, and I've kept it in mind.
The older I get, the less comfortable I feel admitting that there actually is something odd about them. I'm a rational, reasonable person, so I should think it's all a load of tosh. But it's the rational part of me, that can see the cards don't seem to follow the normal laws of probability. Like gamblers who either always seem to have crazy luck on their side, or never ever win, despite the odds.