Captain Planet analogue goes crazy and kills coal workers - Morty is devastated, he agrees it's right to feel bad the planet's dying but the ep implies the correct answer is to do nothing.
Not even 'subversive' Rick and Morty could dare suggest blowing up coal/gas plants without demonising the act (it's quite doable to do such a thing without killing workers....)
Ala a recent trend in modern blockbusters where villains are morally correct in their actions right up until they kills civilians for no reason- just to force a third act showdown, effectively negating their positive ideas.
Also there's an opening joke that is an explicit merch promotion that isn't even ironically done. Just a shitty shirt effectively done to camera. At least Schezuan sauce actually made sense in the show, this was just pure shit. The other eps are good, but the industry in culture industry will rear its head anytime you get big.
Mars is meh, it's very clearly a corporate colony. Like half the dialogue about it is like "ohz your family has a monopoly on the terraformers" and "financial incentives" and shit. It's like a South Korean military/corporate welfare type state.
The OPA people talk more about liberation using proletarian language "it is who build their ships, it is us who mine their ores and water, and we never get anything in return". Fred Johnson is also pretty clearly an internationalist, he is big on cooperation and leveraging the Belt's labor power to extract concessions and control over the ring gates from Earth and Mars.
The OPA is basically the IRA or the PLO. There are tons of factions within it and some are pretty clearly socialist (Fred) while others are nationalist (Marco) and others are just Mafia style mob bosses (Dawes).