Since much of monetary value is related to scarcity, labor is directed to reduce scarcity, not to actions that produce social value.

The pool of people who are capable of collecting garbage is non-scarce, so the price for labor is relatively small compared to the social value it produces.

Advertising is so well rewarded because the attention of consumers is a very scarce resource, so companies put massive amounts of money into capturing some of that.

That statement only holds if you only define "value" as financial gain. I would consider that a dangerous simplification.

That is literally the opposite of what I wrote.

I think this comes down to whether you agree that money == value, and that value == utility (i.e. that people will pay for things that they find useful)