As a French guy, these type of comments make me smile. The GDPR is basically just the implementation of the French law
"Informatique et Liberté" into the European Level. (You can read on HN many Germans saying that it's actually the implementation of the
Datenschutzgesetzt. The truth is: these two laws are extremely similar.)
This law has been in application since 1978 [1]. And in 2018, we have adtech companies like Criteo. [2] I have one of my best friend who started his adtech startup in France. Everything is good.
There's is a lot of implicit contracts (you filled up our sign up form? Well, then you chose to give us your data. ...) The only things you have to do: know which data you collect and give the ability to people to update/delete their data. That's all.
I don't understand the fear. I don't understand what is "vague" about it. It's so simple and low barrier that Microsoft decided to make it the rule for all of their users. But thanks to the hysteria, they made a PR stunt out of it.
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[1] https://en.wikipedia.org/w/index.php?title=Data_ownership&ol...
[2] https://en.wikipedia.org/wiki/Criteo