I’m on Vodafone here in the UK (CityFibre), and they let me use my own firewall to the ONT, and give me a static IP for no extra cost. It’s a PPPoE connection with a VLAN id. With work recently I’m using about 5-6TB monthly data. I should count my blessings for their service given all I’ve read here!

I had issues with connectivity around 2020 and they wouldn’t engage with any help troubleshooting it unless I used their provided router, which was a pita, but a few days of speed tests and they escalated it and fixed it.