You shouldn't use any kind of dating website to find a serious partner most of those are scams or promote affairs with people in relationships or marriages. If you want a serious partner it's not going to be found on a dating site or app you're going to find her in the real world.
I know a guy who found his wife on Match. He had a different approach. He had all the bargaining power and didn't settle because he's tall as fuck and a manager. Of course, a few years into marriage it's looking bad financially, because she's Asian and overspends and feeds villages with filet Mignon back home.