How are they financially compensating you for this benefit they receive? It’s business, and there needs to be give and take including past benefits. This would be a “Does this seem like a fair arrangement to you that benefits us both, friend?” Conversation. If they say yes and try to wiggle through BS this tells you they are not much of a friend.

I used this many times as well. Sometimes people would get defensive and say something like “what do you mean?”. I’d tell them I valued partnerships of a certain type and I can tell we won’t be a good fit together. If they said anything more than goodbye I’d move to wishing them the best and have a good day. People in business who get it won’t push, so it’s really a case of red flags confirmed.