They do this so that they have more ways to contact you if you are a match some day. Apparently not being able to contact matches, due to outdated contact info,

They do this so that they have more ways to contact you if you are a match some day. Apparently not being able to contact matches, due to outdated contact info, is a big problem. Like, on the order of 50%. It's still annoying but at least it has a legit purpose.