Since I believe 2016. It was a nice feature for us contributors. Unfortunately it's not the great payout one would think it'd be. I rarely get donations as it is, and usually it's $5.
1,000 maps on 04/12/2010! -- 2,000 maps on 04/15/2016! -- 3,000 maps on 11/19/2019! -- 4,000 maps on 02/10/2023!