The “distributions” argument always smells like bullshit. Developers actually interested on supporting Linux usually stick to one or two distros of their choice. (Typically Ubuntu.)

My thoughts exactly. It is not unheard of at all for Linux ports to only be guaranteed to function on specific distros. It's well within the realm of possibility and this is not a real stumbling block at all.

Others might do it for them if they shared the source code 🤷

I'm guessing that people just like feeling superior to others and video games are a convenient outlet for that. There's no changing that via game design unless LoL ceases to be a competitive game.

It’s more likely an admission they have to trampoline every gpl function in the kernel which isn’t really easy to do and would let that kernel module run on any other kernel. Otherwise they would have to do a shim like nvidia which would mean a whole other level of issues like saying we support Linux but only Ubuntu which as a non Ubuntu user would mean to me they do not in fact support Linux. I’d vote with walle here but I already don’t own this game as my friends said the user base is terrible years ago but this just means there is no reason to buy any of their games.

This is a game, not something interacting with the desktop much, it can be totally self-contained binary. So they just need to publish a Flatpak or .deb, no need to support bunch of distros that community decided to create and support, because who create a new packaging format should be responsible to promote it.

Typical for a group of people that probably dedicated their whole careers to Windows. Could have just put it plainly that they don't want to pay engineers that have the skills to do this on Linux.