Earlier quoted context omitted.
You specify it as part of your profile. If you pay for A-List (paid plan), you can filter potential matches by body type. Disclosure: Paying OKCupid customer. I don't mind paying to support the service, it's provided ongoing value to us.
I have to wonder how effective paying for a dating site really is. Presumably if you find a partner through the site you stop paying? Aside from a token few they can blog about, what's their incentive to be successful?
Those who are seeking committed long term relationships, yes, likely cancel.
Those who are seeking short-term/multiple relationships and would like a revolving door of them... subscriptions continue to renew.
Probably has a lot to do with the price points between 'casual' dating sites/apps like Tinder and OKCupid compared to something 'more serious' like https://www.itsjustlunch.com/ - where it _starts_ at $2,800.