But I can't see myself escaping from Photoshop anytime in the next couple of years. I have a lot of special export scripts in 'Adobescript' (yuck) that carve up my high res art assets, slice them this way and that, crop, hide/display different groups and export in particular ways. Nothing unusual, it's just a lot of grunt work, but I have it set up so that clicking a button in Photoshop will just Do It All and have it work. It'll take some time to set that all up again in a Photoshop alternative.
The nasty payments stuff detailed in the twitter thread is just the usual Adobe nastiness, some product manager somewhere is trying to juice the numbers.
My own billing experience with Adobe recently was needing to change my account's country from UK to Canada, as I've moved, and the VAT number and sales tax stuff is of course all different. The poor support person I spoke to couldn't fix it for me, they had to have a backend engineer manually change alter a field in a database somewhere - it all sounds like a terrible mess.