Got optic to SFP bridge from my ISP (only because I insisted on using my own router) , that was fed into SFP to RJ45 adapter that I have bought (via Amazon - apparantly the ISP’s have lobbied to not import it here) and then connected my router.
That went somehow ok untill I switched ISPs , now the optic cable is fed into an ISP provided decryption module , paired specifically to the mac address of my router.
It’s like the ISPs went onboard with upgrading to optic because they could excert more control over their customers.
Someone should tell killedbygoogle.com about this astounding development