* Where's your privacy policy?
* What/how are you handling the different customer protection laws? What juristictions are you working in? Where's the data hosted?
* Where's the design description?
* What encryption are you actually using? If you rolled your own, then well.. good luck.
* How could you ensure end-to-end encryption over multiple protocols, without either completely reverse engineering said protocols? If your answer here would be that you're using a central server where messages get passed between services (and thus decrypted), it isn't end-to-end.
The site is also very flaky. Sometimes it loads, sometimes it doesn't. There are so many questions, and zero answers.