"Never believe that anti-Semites are completely unaware of
the absurdity of their replies. They know that their remarks
are frivolous, open to challenge. But they are amusing
themselves, for it is their adversary who is obliged to use
words responsibly, since he believes in words. The anti-
Semites have the right to play. They even like to play with
discourse for, by giving ridiculous reasons, they discredit
the seriousness of their interlocutors. They delight in
acting in bad faith, since they seek not to persuade by
sound argument but to intimidate and disconcert. If you
press them too closely, they will abruptly fall silent,
loftily indicating by some phrase that the time for argument
is past."
Which project did they not release GPL'd code for? They do have the kernel source available: https://github.com/reMarkable/linux/tree/zero-sugar
The top level github page also lists their trees for other projects.