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Your above question is a whole different can of worms.
I join sites for research and to make sure they are not fucking the people I am sending with screwy billing practices before I promote them. (few other reasons as well)
Screwing people is not in the majority though.
Your example is a trial membership turning into a full membership which is not unethical or wrong as long as it is fairly disclosed. I am pretty sure most understand what a trial is and why it works the way it does under most circumstances (few people do fuck you on those as well).
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