I have been wondering for a long time (about 9 months now, ever since I saw the post!) what type of map projection was used in this particular post: https://www.reddit.com/r/dataisbeautiful/comments/tpq3bz/oc_global_wealth_inequality_in_2021_visualized_by/

I tried to look up map projections online, browsed through the list on Wikipedia and other websites, but none of them look exactly like this one. Can anyone tell me what type of projection this is?