Hi Bro, yes this is for against DDoS in front of an onion balancer. You know for Tor, at this moment, DDoS is unavoidable so it has to be something like captcha as clean net does.
Sure it is a very meaningful question about the trust of the escrow. We will have a blockchain version soon and money will be hold in Ethereum smart contract. Honest, for small amount deals, we suggest using off-chain escrow like this instead. For blockchain, every "write" actions need "GAS" to complete. It will be costly for small deals.
Something is pissing me off. With tor browser I can easily browse other sites but with this forum it is giving me very slow experience. Sometimes it's not even loading the forum pages.
Anyway,
https://i.imgur.com/sY3v6K2.pngThis is something new to me, how do you resolve this captcha?
About your service, why would anyone trust your service. You have no background to prove that the funds are safe. Isn't it same to trust an unknown person and trusting you?