[1] https://www.nswp.org/sites/nswp.org/files/Declaration_bookle...
I've literally never seen a functioning union anywhere I went (I live in Europe). Everyone I met in my life, in a bar, etc is angry at their unions.
Incidentally, I personally think the limit for communist societies is around 50 people or so.
Another issue is that people have unrealistic idea about what can and should be done in a day/week/month. They don't care about their own work nearly that much, and will forgive themselves a lot, but will expect others to upheld that unrealistic standard.
On the flip side, as a native Scandinavian I have many colleagues from outside of Scandinavia that moved here because of many of the things unions have accomplished - 25 days of paid vacation, a culture of working your 8 hours a day and not more than that, and a child care system that allows you to spend more time with your kids.
Not all of them are, but it does not seem like the issue has been solved.
"Exploitable people are pushed into sex work" is closer to being true than "sex workers are exploited," only because almost no one starts out as a sex worker if they have better opportunities.