The series does not have 1,020 episodes. The official distribution is as follows:
If you’ve stumbled across a playlist or video title claiming Angry Birds Toons has 1,020 episodes, you’ve encountered a digital ghost. The beloved animated series, produced by Rovio Entertainment, ran for only three seasons between 2013 and 2016, yielding a tidy . angry birds toons 1020 episodes 1020
And for those still holding onto the 1020 dream: check out fan-made compilations, mashups, and “all sounds remixed” videos that stretch the spirit of the series into endless loops. The series does not have 1,020 episodes