I’m out at the slightest hint of dodgy. I’d rather over react and miss out on a few items that might have been legit than walk into a bad situation.

Sellers being reluctant to hand over an address in advance is one of my major red flags - I want to be able to check where I am going and let someone else know too. I’ve had sellers do this whole run around where they won’t give you the street number until you say you are in the street. I’ve no idea how they think that’s going to protect them from dodgy buyers, but I’m not following breadcrumbs to walk into a stranger’s house. If people are not upfront I just don’t deal with them.

People who are very pushy about wanting you to move off the sales platform and phone/text are also a red flag for me. Your phone number is important personal data that it’s better to avoid giving out unnecesarily. Especially if you have Pay id linked to it, because then you are also giving out your real name.