Thing is....it’s not $50

https://www.sportys.com/pilotshop/halon-fire-extinguisher-small.html

https://www.aircraftspruce.ca/catalog/pspages/a344t.php

Plus an A&P needs to install it so that’s $300-$400 at least per plane for something that is NOT required.

I’m obviously being facetious but what else you want that’s not required?
Ballistic recovery system? 6 point harness? Ricaro seats? Garmin 530?
LED landing lights?

These are all “safer”.
Now I get the point you’re trying to make but they have a business to run.

Buy your own.
They’re $20
https://www.homedepot.com/p/Kidde-1-A-10-B-C-Recreational-Fire-Extinguisher-21027405MTL/303196116