The problem isnt a technical issue, its a social problem Short of bringing your stuff to a physical local swap meet, there will always be issues in coordinating some meet up time. There will always be something with low balls, i know what i got mentality, scammers.

There is a reason why second hand shops and thrift shops are still in business.

Peertube is perfect for those niche things that aren’t revenue friendly. Add in the creator needs to be big enough to be self sufficient from patreon, its the plateform that isnt limited by ad sense BS or what trendy shit is happening.