Why do a notable number of guys get asked what their height is on dating apps/sites, but seemingly aren't allowed to ask the other person's weight?

Anonymous
It's never made sense to me. On the one hand, height is a variable entirely out of everyone's control, whereas weight is within one's control to a large extent.
Why do a notable number of guys get asked what their height is on dating apps/sites, but seemingly aren't allowed to ask the other person's weight?
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