You think it's big now, just wait until July. Reddit's api changes are going to force people off of the site in droves. Right now it's a lot of noise and some movement, but a lot of the regular user base hasn't actually felt any effects yet. Once the changes make the site unusable for a lot of people there will be a lot more.
As someone who just deleted Apollo and tried to use the Reddit iOS app - this is exactly correct - site is unusable on the official app. People will flee.
95% of the people using reddit on mobile are already on official reddit app. Apollo going down isn't going to cause a massive flee, just a portion of the small userbase that is Apollo users.