After five hours of synchronization just 1% finished, and offers were still not visible. Apparently the blockchain is loaded, something I don't want to do to myself.
Then I aborted the procedure and removed the program. So I cannot use it yet or recommend it to others.

I must admit that I have also lost the further interest. The awareness to become a victim of censorship is disappointing.
We do not need another ebay in the crypto area. For controlled and regulated goods, Fiat already provides unbeatable options.