Discussed in a few past threads:

Photopea: A free alternative to Photoshop used by millions of people - https://news.ycombinator.com/item?id=26898836 - April 2021 (5 comments)

AMA: Ivan Kutskir, creator of Photopea - https://news.ycombinator.com/item?id=26768550 - April 2021 (267 comments)

AMA with the Creator of Photopea - https://news.ycombinator.com/item?id=24143189 - Aug 2020 (6 comments)

Reddit AMA on Photopea, a free alternative to Photoshop used by 1.5M people - https://news.ycombinator.com/item?id=18397380 - Nov 2018 (179 comments)

My name is Ivan and I want to make the best photo editor - https://news.ycombinator.com/item?id=15924402 - Dec 2017 (80 comments)

Surface Blur and Median - https://news.ycombinator.com/item?id=12612720 - Sept 2016 (34 comments)

Photo Pea 0.3 – New features - https://news.ycombinator.com/item?id=6624264 - Oct 2013 (7 comments)

HTML5 image editor wants to replace Photoshop and Gimp - https://news.ycombinator.com/item?id=6396474 - Sept 2013 (4 comments)