I am not saying media is not bias, but that some media just spins the truth, whereas others do not have a problem with fslse reporting. After all tankies are called tsnkies, because they ignored that the Soviets used tanks to violently get rid of the Prague Spring. This happens on the left as well.
And yes that is why I like reading economics news websites like the economist. They report on subjects left leaning news tend to not care about, but which can be incredibly important. Also with rich people using their reporting as a bases for invedtments, makes it hugely important that they do not outright lie. Commentary on them is horrible though, unless they go somewhat agsinst the neoliberal norm, which is rarer, but usually some of the best stuff.
Usually those artist did get some recognition during their life, but never got into the main stream. That changed due to the main stream changing and the people who did like the art showing it again. That is actually rather easy to do with something like the Fediverse. It just requires a download option. Especially when everybody is aware, that the content will be deleted, that would be a decent option.
Also a lot of content on social media in general is very short term. Stuff like politcal discussions are fairly useless after a few months in most cases. So that can be deleted without much care and again, if somebody wants to preserve it, they easily can just download it.