I may be prematurely judgemental here but I just can not take a project named "floorp" seriously.
Your second paragraph is more important though: none of these let's call them Firefox distributions are proper forks. They're not developed by teams who could develop and maintain a browser independent of Mozilla. I believe that's what your parent comment means by a "serious fork". Floorp and Waterfox and LibreWolf are not that.
After using projects named like "slurp", "eww" (combined with "yuck"), "yay", "honkers railway", "jason" and many many others, I personally kind of gave up on any attempts to judge projects by their titles. Partly due to many developers being whimsical nerds, partly because even marketable names say nothing about the product half the time so what's the point anyway
I "forgive" them too, I have no animosity towards them and wish them the best. I just think that the name communicates a lack of seriousness. That's not a criticism, I have plenty of non-serious projects
Your second paragraph is more important though: none of these let's call them Firefox distributions are proper forks. They're not developed by teams who could develop and maintain a browser independent of Mozilla. I believe that's what your parent comment means by a "serious fork". Floorp and Waterfox and LibreWolf are not that.