While this may be a good end goal, these comments are really more harmful than anything else. Removing your dependency on some proprietary service can be very far from trivial, or even doable, there is a wide-range of internal or external factors preventing you from ditching it.
For example, part of my work and a bunch of good online friends of mine use Discord, so I keep it around. If you do any social gaming as well, you'll also most likely find it hard to ditch the platform, as it's grown deep roots in the community.
Anyway, it's better to take small steps in the right direction than trying to make a U-turn and fail miserably.