content: This. I'd pay for pushbullet if it was open source, at least on the client side. An audit of the client stuff could negate the issue of their server being used. It's easier to use their servers than my own as port forwarding and monitoring said ports/servers is difficult. If they kept my data on their server, but it was known to use strong crypto, it wouldn't matter until quantum stuff, and I don't care if they get it then.