To be honest, no dating website is really free. You either are asked to pay when you want to use premium features or you’re data is sold to advertisers. And the latter type is the worst of the 2 kinds. That’s because it’s a barrier to entry, it’s often rife with freeloaders and dating site scammers.
Also, now there is a new Marriage Only Match dating website, GoMarry.com. Yes, it’s free to join but when you want to use the premium features, you will have to pay. It’s a minor investment for finding someone super serious about a long term relationship, i.e they want marriage and family.