This boils down to difficulty of enforcement. Enforcing the law regarding stop signs is very difficult because it's hard to detect all the violations at scale. Tracking, though, is much easier to detect even automatically by its very nature.
Tracking arguably isn't much of an issue until data sale and aggregation gets involved. That requires a functioning marketplace which tends to leave a lot of evidence behind.
The hyperscalers are a notable exception to that but the larger a company is the more likely systemic illegal practices are to get exposed.
