Front ends may block uploads to their image hosting. That aspect is very much centralized currently.
I actually have a concept in my head to address this using the SiaCoin network and caching technology but not sure if it's viable. But that won't solve your problem now.
Maybe you can try Partiko. Alternatively you can upload to Imgur and just link. It's not convenient but it will work.
As for the comments, it's not possible I'm afraid after the first vote or comment hits them as far as I know. You can edit the comments, though.
Maybe put in [deleted], [redacted] or something to that effect.
If you do not wish to interact with me, there is a mute option.
Best of luck to you.
Posted using Partiko Android