@Crazychris People give advice only to help. Doesn’t mean that advice will work for you. It only means it worked for them. I believe they were only trying to give you a different perspective but it’s up to you to do what’s right for you. I’m sorry you had a bad experience and I’m not giving advice, just another way of looking at things. In the end it’s your decision.
Getting a post removed is rather arduous on OfferUp (this is why you see so many multiple/duplicate ads, intangible service related ads,etc.), unless they are on the top top 4 of the prohibited items. It's not a competitor (the reporting system is not like CL).
Perhaps, you should reveiw the items that are prohibited on OfferUp here .