This TCPA article popped up in National Law Review (sorry this only pertains to the USA):
https://www.natlawreview.com/article/tcpa-regulatory-update-fcc-releases-public-notice-soundboard-technology-and-list
I don't want to repost the entire article, but this section of their newsletter mentions that the FCC is about to wrap up their rule-making on what carriers must do to implement carrier-based call blocking.
From what I understand, once the rule is in place, Tier 1 carriers (the type that service most consumers) will finally have the first taste of call blocking at the phone switch level. This includes a "Critical Call List" which would be made up of mostly government units and medical providers who would be exceptions to any carrier-based call blocking.
They also appear to be taking the strategy of "opt-out" rather than "opt-in", meaning that once a carrier deploys the feature they are to enable it on all of their customers and customers who do not want it will need to opt out of it. For seniors on land lines this would probably mean calling the phone company or sending in a postcard with their phone bill payment to opt-out, which I would expect most people wouldn't.
Oh and there was this hilarious part at the end of the newsletter:
"Finally, stakeholders from the banking and alarm company industries met with staff from the FCC over the past month to express how recent FCC decisions and interpretations would negatively impact their ability to send time-critical, non-telemarketing communications to their customers."
Basically both these industries have debt collection and marketing robocalling they do very heavily; so when carrier-based blocking does get implemented I would imagine both these groups are going to see their CIDs getting banned. YouMail has started to become more and more worthless as they've been working with debt collectors to get their DIDs exempted. NomoRobo and RoboKiller continues to flag debt collectors and their app still continues to hangup their calls. I wonder whether the carriers are going to build their own list or rely solely on the apps the smartphone app makers maintain privately.
Maybe we could get into this business by publishing the BobRTC listings openly and see if any carriers would like to accept us as a data source.