[madjam002]

A good fibre ISP will have a separate ONT and router, so you can still pick your own router.

The ONT should be considered part of the ISPs network and not tampered with or replaced. Fibre with an ONT (PON) is a shared medium with other customers, and trying to use your own equipment has the possibility of degrading service for other customers.

[vel0city]

In a DOCSIS network the coax is a shared medium with other customers and at least in the US you largely could bring your own modem, within approved device lists.

[madjam002]

Ah ok, in the UK our only widespread DOCSIS network strictly forbids 3rd party modems for the same reasons I mentioned.

[nicolaslem]

The same can be said of cellular networks where in most part of the world connecting your own equipment is accepted and expected.

[p_l]

It grew out of many countries licensing the specific devices at national/trans-national level, not telco level.

Though there were throwbacks, like early iPhone, with special tariffs, but those were 95% for business reasons not explained to end buyer and 5% for marking the terminal in network as "the one that is slightly out of spec and remember to special case call redirection"

[madjam002]

True I guess, although one would perhaps expect a fibre network to be more reliable and stable than a cellular network.

Why would a large ISP allow customers to bring their own ONT if it means higher chance of problems on the PON? It doesn't seem worth the reputational risk. Allowing customers to bring their own router doesn't affect other customers.