> Aren't the biggest corporations doing the same on orders of magnitude larger datasets? They get away very well with merging data from quite a few acquired companies.

Yes, and it's worth noting how few data points one needs to identify an individual.

>If small companies are called upon compliance with such vehemence, the big ones who know so much of us should be brought up, at least 100x times more.

Absolutely, no argument from me here.