This sounds like a pretty huge hassle to me as a phone customer, honestly. I'd prefer that they just have to get my consent first. It would be a lot cleaner and easier for everyone, including the marketers.
Did you want the version where consent is easy to get and then you still get tons of spam calls, or the one where consent is hard to get and then many useful services don't exist?
And how would a consent law help anyway? Many of these calls are literally scams. They're already illegal and the problem is a lack of enforcement.
If you are that bothered by spam calls you probably need to make the tradeoff that you’re ok with not being able to reliably receive calls from numbers that aren’t on an explicit white list.
Various fixes are underway but today you have to make that personal trade off.
