[Mesh] cloud services that promote data privacy?

Usually I think of cloud-based services as necessarily antithetical to user data privacy, but telegram doesn't seem to think so. They claim to be very interested in privacy (read here: https://telegram.org/faq#q-what-are-your-thoughts-on-internet-privacy) and also not to currently be or ever become motivated by profit, but they store most of your data (encrypted) on their own servers for convenience (easy access, search-ability, etc.) Is user data safe with promises like these? Is the threat of legal action enough to guarantee that an organization like Telegram is indeed practicing what it claims to be practicing? https://telegram.org/privacy --Benny p.s. Either way, it's nice to see user privacy get so much attention.