Out of curiosity, i looked at the giveaways i joined.

34 / 18,533 = 0.18% which is higher than the average chance of winning on most of the giveaways i enter.

1 entered 16 won

402 out of 44,204

I am winning now about 1 / 2 games per day

3/1455

0.2%

14 wins out of 1286 entries, a little over 1%.

Works for me!

130/13013, 0.999%
I think that can be contribute to several factors:
1) LV1 vs LV4
2) I am in a smaller region, and constantly search GAs from that region.
3) I am a SG forum ("Discussions") leecher :)

13 / 4206
1 / 323
0.30%