As a Linux user I agree with GP that Linux is only as safe as it is because it's not a target. It's pretty clear that large tech companies cannot be trusted, I definitely wouldn't run a binary provided by Facebook on my machine. I am hesitant about running apps like Slack and Dropbox, and would prefer not to give them full access to my user account[0], but I need to use them so. Desktop container technologies are maturing nicely, so hopefully one day we'll have permission prompts where we can restrict what an app can access.

[0] Yes I understand I could run them as a different user but that's not very user friendly at the moment.