This is unlikely to be acceptable to the mass market until the SIP/VoIP setup is simpler and preferably automated, it's especially unhelpful when a large supplier like BT insists on having a proprietary DV service as that is not the right way to automate these installations as it's effectively revenue protection.
They’re all doing it, Virgin Media, BT/EE, Vodafone broadband, Sky, and others. At least you can reject at purchase stage. The problem is when you are migrated and then find you can no longer change the router, that is where Advertising Standards and Ofcom need to ensure consumers are aware before purchase.
24 years of broadband connectivity since 1999 trial - Live BQM