Some similarities with Photoshop are necessary to guarantee the PSD support (same layer properties, same layer styles, same adjustments - for adjustment layers). Otherwise, I think that all image editors look quite similar, e.g. https://www.Pixlr.com/editor , Pixelmator, or Affinity Photo

look and feel is not copyrightable.

Images and display code, however, are.

https://newmedialaw.proskauer.com/2016/02/05/website-html-is...

Just looking at it, it appears to me like the layer visibility icon is the exact same icon.

This is more than playing with fire.

Maybe the play is to get people using it quickly and get bought by Adobe as a way to resolve the legal problem. The owner is putting themselves at a huge disadvantage in negotiation doing this.