Wow! Excellent work! Would you not want to make this an official KDE project and get the full support from KDE?
Most KDE projects are acts of (dare I say it) love 💘 . People start projects, contribute to them, and maintain them, because they love them. The original spark may be need, an itch that needs scratching, but what keeps a project going is the thought that "wouldn't it be fun if...".
So that's your first reason.
The second reason is that the status quo doesn't stay the same forever. You are right: support for Linux on streaming for Linux users sucks and is often deliberately fked. But the status quo of, say games on Linux... oh, what? Five years ago? Also sucked and was deliberately fked, and look now.
KDE is not a company. It's contributors do not have to adhere to schedules or the current status quo. They can wait and improve as they wait. Very often the work they put into pays off in the future for the benefit of everybody.
And that is reason number 2.
OP, you can help people avoid visiting the Nazi site by using XCancel:
Please do not spread FUD. It's not "in KDE Discover". It is on some distro's repository. What a distro let's on their repository is not KDE's responsibility.
Yes, absolutely. Go for it, please.
Yes, but not very useful for our use case. We want to copy things super simple.
Not cheap. €50 for ten, but they are re-usable, so...
? These will be used by the Spanish KDE team and have been made by said team. They are not to be distributed or left lying around or anything like that.
Off topic much?
Get in touch with the folks running the "We care about your input" goal at
https://go.kde.org/matrix/#/#kde-input:kde.org
They may be able to advise something.