> "the only protection is to not give them your phone number in the first place."

That has its own risks. If you don't provide it to google and your account gets hacked, it's extremely hard to get it back. (My wife lost her original gmail account that way about 2 years ago. And of course there was no way to get any live support to try & fix it)

Basically if you don't provide your number, you're more open to the more prevalent traditional hacking. If you do provide a number, you're more open to a slightly less prevalent type of hacking. It doesn't leave much to choose from.