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You have to ask them. I don’t know but maybe because I wrote my comment on their @esteemapp Try it yourself

I used it some when it first started, like the notifications, I have to try it out :)

I use it mostly because I have issues with my spine and can’t sit much on my laptop to reply to comments or to create articles. I also find this app helpful to get notifications. Good luck with it.

They randomly do when you comment on eSteem. Not every comment get it.