I'm an older guy perhaps that's why my expectation of web dating site is that it's just a tool to use to facilitate meeting someone.
Surprise surprise, there are both nice people as well as manipulative assholes who use the sites. It's for us to figure out who is one or the other, the site isn't going to do that for us. I've been with my lover now for five years, who I met through a dating site that no longer exists. Without that site I would never have met her.