Now that ISPs are free to collect and sell our browsing histories as of last year, I wonder if these firms will work out some kind of deal with them to circumvent cross-tracking blocking?
ISPs have been able to do this forever, just in aggregated form. They could also do that on a household level by arguing that household is the level of aggregating.
This hasn't changed, although people believe that it has. The data isn't granular enough to be actionable, at least at a household level.
Theoretically they could insert tracking cookies into your data stream, but realistically speaking the incremental revenue they'd generate from this isn't enough to offset the consumer outcry...at least today.