For anyone that for some god forsaken reason decided to start using Twitter as their primary art gallery, please stop. Twitter is soon going to amp up its shitty format switching and compression bollocks to the max.

https://twittercommunity.com/t/upcoming-changes-to-png-image-support/118695

The tl;dr is practically any PNG you upload is going to be turned into a 85%  lossy JPG with compression artifacts, even if you had transparency on it.