Pixilart does not appear to be FOSS or source-available
Pixilart is currently classified as "Free and open-source (or source-available)" but I am unable to find any evidence of it being either free software, open source software, or source-available software. No repo on GitHub, Codeberg, or anywhere else. Their FAQ also mentions no source code. I also looked at their mobile app, but nothing. So it seems there is only the website www.pixilart.com and a mobile app. Looks like proprietary software to me then.
Pixilart also offers a paid "Pro Membership" for stuff like ad removal, which is missing from the current classification: https://www.pixilart.com/subscribe
If I'm correct, Pixilart should be reclassified as "Free of charge" and "Subscription for more functions".
Agree, I can't find any reference to being FLOSS.
https://alternativeto.net/software/pixilart/about/