Well those get taken down by the big corpos, not really the developer’s fault. Really, the fact that they are FOSS mean it’s much easier to fix issues as lots of different people can contribute, and where you mention apps that get taken down and formed again is only possible with FOSS apps (i.e. forks)
FOSS programs that don’t involve piracy are perfectly fine though (libreoffice, inkscape, kdenlive, linux, among many MANY others), they all work wonderfully
I’m on the beta 2, it’s still hard to read. My background has a very light sky with a dark tree. The buttons seem to adjust for the dark tree, meaning when the buttons are over the light sky (which is in the middle of the screen, where the buttons normally are…) it is unreadable! It’s better when the buttons are over the dark tree (still quite hard to read though), but that’s only when I have half swiped up…