he started sending me his crypto wallet and insist i should tip him some money and i didn't agree since he volunteered to post and his post reached less than 15 people in that time.
How do we know the person saying the truth here without any tangible evidence to proof all you're claiming, sometimes you need to clear the air when dealing with someone especially on anything that has to do with project or contract, what terms have you both signed before engaging it, of course he may try to sabotage you when he discovered your business he's helping you advertise has boomed up, but this will also be a lesson to you to always have a statement of contract signed by you both before you entrust him for the advertisement of your services.
This whole situation shows only how toxic this space can be.
Don't conclude your judge on the experience you had with a member, you could have been in thw same shoe if you're a newbie or legendary rank doesn't mean youve got everything it takes with good reputation, and i say it again that you should report him provided that you have life evidence to proof your claim to ascertain it with reference pointing to the whole scenario, if not your tag on such member may be invalid without a reference.