You're conflating what sex workers do with what people who feel lust and excitement and decide to get intimate do.

You should spend some time with sex workers. Pretty much the first lesson in this line of work is that you act well and submit to the whims and wishes of your clients, and the second lesson is to put some hard limits on what you'll do or you'll be abused.

It's generally an act, one person faking attraction or friendship or whatever and another person paying for it. Sometimes sex workers get to know clients personally, but outside porn where the 'client', i.e. the producer or whoever is paying, isn't the one you're fucking I've never heard about a sex worker initiating a non-paying relationship with a client.

To answer your actual question, no, this is not a common type of behaviour.

You're conflating sex workers with sex slaves. Nobody's forcing you to be a sex worker for them if the job is done within the confines of the law between consenting adults.

Unemployment is low in the developed west, there are tens of thousands of other legal careers you can choose if you want to support yourself.

There's no manufactured imbalance of power here since nobody's forcing you into sex work. You choosing to strip to gooners online for money is your voluntary choice as an adult so take responsibility for it and don't outsource it by blaming those paying for your life choices.