These people apparently only considered the possibility that large people would be discriminated against. It never occurred to their prejudiced little minds that some people are interested in seeking bigger people to date.
They know damned well that some people are interested in that. However, the feature is way more likely to be used first to exclude fat people, second to find fat people to fetishize and treat like a fat fuck doll, and only third because someone just happens to prefer fat people.
However, it's also a truth in advertising feature, and if nobody is forcing you to accurately select your body type, no one is being harmed against their will. So waaaaah. Which, frankly, is how most of these discussions should go.