Free Software Foundation Europe has created a handbook and a wiki on Router Freedom in which they advocate for end user freedom in choosing routers instead of the ISPs forcing them.
Announcement: fsfe.org/news/2023/news-20231214-01.en.html
Wiki: wiki.fsfe.org/Activities/CompulsoryRouters/
Handbook (pdf): download.fsfe.org/routers/fsfe-router-freedom-activity-summary.pdf
A map showing their progress in getting EU countries to introduce regulations: Router Freedom Tracker - uMap