One starts to wonder should we just make advertising illegal. As it seems, it is waste in both paper form and as online adds with all the tracking involved...

what's the line between advertising and protected speech?

trick question: there is no line.

Billboards aren't banned in your state?

https://movia.media/moving-billboard-blog/why-is-billboard-a...

The supreme court, unanimously, in Rowan v United States Post Office Department, "categorically reject[ed] the argument that a vendor has a right under the Constitution or otherwise to send unwanted material into the home of another."

"Consequently, a mailer’s right to communicate ceased at the mailbox of an unwilling addressee."

I would be very suprised if SCOTUS would agree this ruling supports any legislative attempt to preemptively block "communication".