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That's estimated wins, not the chance of winning one

A rough estimate of how many games you could have won so far.

As said, estimated wins. Based on your giveaways entered how many wins you are estimated to have. I recommend not even paying attention to it.

wish it would be a chance :D

Are you talking about estimated wins? And saying "No stupid answer please." is silly - no one who intended to give a stupid answer will be deterred. Worse, many will be incited to do it.

It's the best case scenario of how many games you could have won based on the number of giveaways you entered and the chance to win in each of them.
For example, if you have entered ten giveaways, 100 entries in each, you had 1% chance to win each of those. You entered 10 giveaways, so adding that up, your estimated wins would be 0.1

100 / Entries * (number of copies) = Win chance

it was quite obvious.

No stupid thread titles please.