there are a fuckton of brutalist buildings with incredible murals, glass art, and other colorful structural elements tho! media can't use those as an easy visual shorthand for a bleak dystopia or unknown lands whose main export is crime ofc, so they get less airtime than the washed-out, blocky concrete, but they exist
the thing is, in socialist states, there still were (and are) a lot of artists, art schools, and jobs in artistic fields, with less press, but often paid jobs. censors wouldn't let you put up openly critical art in the big institutions, could imprison you for criticism, and the stalinists and mao's culture revolutionaries did consider most modern art bourgeois decadence, i.e. anti-communist. some fled, some went underground, but a lot simply kept making art, for the people, but rarely for an art market as criminal as now.
Brutalism is in itself an expression of this: destalinize a bit and give architects a new industry for post-war reconstruction, a new material as flexible as reinforced concrete, and a mission to get ready for the baby boom, and you'll get both great art and some choice mistakes, unlike anything before.
but in many socialist countries, everyday art experienced a boom as well: you may have seen the posters for the space race, films or propaganda, but art expressed itself in the buildings, as above, furniture design, pop music, clothes, and there even were space vacuums and samowars - probably not for everyone, but for many who'd never had one. the focus on art for the people, and giving a lot of people access to the means of producing art, led to a sort of revolution in art, imo pretty close to what the Bauhaus had envisioned.
the shift to actually consider this art as art, instead of design or just the stunted remains of art under censorship, is still ongoing in (US/eurocentric) art history, with all the usual post-socialist and recent russophile pitfalls. "paying artists is a good idea, censoring them is a deadly one" could imply too much already, but I'll risk it.
artists starving isn't necessary, not even in Paris, and art lives on in plain sight and underground, even under censorship, but the artists who got ended or never started you can't get back. they may have been awful, or a van Gogh, but your taste, of all people and all ideologies, shouldn't decide.
might add some photos from an exhibition later, but taking a peek @sovietpostcards can give you an idea, and sorry, but not all sorry, for going history on a great joke!