I decided to invest in a p2p crypto exchange. Something like http://localbitcoins.com, but with a p2p exchange that will allow you to make operations not only with Bitcoin, but also with 5-10 altcoins

Please, could you:
1. Provide me with some useful criticism of the idea and provide the cons of it
(Besides, the ones like “You must pay way too much money for development”, “Why? It will be banned soon”, and “You will spend a fortune on PR”.)
2. If you have ever used http://localbitcoins.com/ or https://paxful.com/ describe your negative experience, please. What would you like to add to the functionality of these exchanges? I would love to hear any details you can provide.
If you use http://localbitcoins.com/  for various operations a lot, it would be nice to hear your feedback! If you don’t want to write in this thread, I would appreciate speaking in PM.
Best regards!