... But where is that women's football league that excludes cis women while still calling itself "[just] women's football"?
Whereas we already have many women's leagues in sports that exclude trans women.
So if it's actually happening, then sure I'll agree to calling it "taking a title" and honestly be against it; imo it sets the fight for trans rights back if we use "woman" exclusively for trans women and cis women only ever get called "cis women". But again, where is that happening? Who is calling for that?
I only ever see people claiming that cis women should have exclusive use of the word "women", not the other way around. Which is just another way of arguing that trans women "aren't really women"...
In case you don't already know, that concept has a name: Fly Wheels (wiki link: https://en.wikipedia.org/wiki/Flywheel ).
One of their main problems is that, as you pump enough energy into them to justify their cost compared to other storage mechanisms, the spinning mass becomes more and more of a danger if it ever breaks loose. Not to mention the gyroscopic effect making a "fully charged" fly wheel very hard to safely move.