I once was half way through a road trip when google maps routed me off the highway, through a walmart parking lot, and onto another highway.

I assumed it was a badly performing algorithm. But if it had instead routed me through a McDonalds drive through, I'd have assumed it was foul play.

I think the article makes a decent case that this was the former and not the latter, though it would be interesting to see route leaks visualized on a map over time. Too many odd coincidences could sway me the other way.