Landmark legislation is law that changes the legal landscape, aka: it’s a trendsetter or underpins important legislation.

Surveillance pricing is setting prices based on observations made of an individual, in the vast majority of cases through cookies and other online tracking.

So this is formative legislation which bans the use of individualized pricing based on a person’s habits or history.

Headlines just have a whole different linguistic standard. I think It’s a fun little cultural relic, but nowadays there’s no need to keep them as short as possible, as long as they’re under the character cutoffs most aggregators have for post titles.