It's sad but I'll forever remember them for having the best tagline ever on their frontpage:

    "Send messages, not metadata"

We all know who this is directed at: the project(s) pretending to offer privacy but that need to collect your cellphone and that'll happily be able to know who you exchanges messages with.

Project(s) whom, moreover, have often weird shills that, if you squint your eyes just a little bit, suddenly look like xxxINT moles.

So if only for that tagline, thanks a huge lot: metadata are more important than the content of the messages themselves and you have no privacy if your phone number and contacts are known.