They may have undiscovered security problems, and if any such problems exist, they will now never be fixed, leaving you vulnerable to attack.
There is no intention to cease support for non-mobile users, just to reduce effort supporting older browsers like IE7 and IE8 (which themselves are going to become unsupported by Microsoft by early 2016).
The "attractiveness scoring system" is a pretty complex algorithm that calculates attractiveness beyond a swipe left or right; the quality of interest and quantity of interaction a user receives from other users play a big part.
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No one likes getting dumped, but you know what sucks even harder than that?
Enter Clover, the dating app that doesn't believe you should swipe away someone with an unfortunate selfie just to get to the next profile.
Part of the problem with Tinder and apps like it is that a lot of people seem to use it to simply flick through the profile pics with no intent to meet up.
Maybe you have a dope smokey eye that you don't want to go to waste or your flirting game feels extra strong.