Tortuga:
Gotta keep the punk in cyberpunk, or all you have is cyber.
Do you know what the 'punk' is though? It's the organized criminal underworld, the 'dispossessed' street level life, the
rage against the 'man' (which takes form in both anti-government as well as anti-corporate anarchism), drug use, promotion of violence as a problem solution, etc.
None of which require or even delve into "(un)ethical consumption of capitalism or exploitation of the working class".
Indeed in some settings (Shadowrun for example) the megacorps are often shown as expending resources to protect their people (regardless of class). The Characters in that setting are most often made up from the criminal underclass which aren't capable of working
within the system, and thus they fall outside of it. You can argue that by selling their talents and being expendable, the megacorps are somehow exploiting them, but that's a grasp.
Is capitalistic exploitation* of the under-class a thing in GURPS Cyberworld? Probably. I'd argue that by having a legal underclass which has no protection under the law, that yes, it is implicit, if not merely implied, that this is case. However, GURPS Cyberworld is pretty much the only setting I can think of that makes exploitation of the underclass a thing.
* Such as
legalized slavery, wage-slavery, higher tax rates, reduced rations, etc.
It's certainly a very Libertarian economic system portrayed in Cyberwold, which does implicitly require the exploitation of the working class.