If they are paying $15-20 for a simple article then they must be earning more by posting our crypto writings.
I would be glad if someone could enlighten me about this platform where we can earn by posting altcoin articles.
Most of the time they will post the article on their website, get some visitors and they will earn from some ads. It is possible too that they are selling your article so other website owner and will do the same
I guess their will be a time where these services would be caught by our mods and devs. Because it may not be illegal but some writers would just copy paste things and say it is from them. Or it will become spammy on the service section.