[kevingrahl]

I’m assuming you’re just joking but think about location tracking the next time you want to attend some demonstration for example.

Should be perfectly legal to demonstrate but if you’ve got you’re phone on you someone will know you were there and protesting for X.

That’s very valuable information not just for law enforcement but also for marketing/advertising and also for more scummy stuff like influencing your political choices (eg Cambride Analytica style).

I don’t have my phone on my when I attend events that could “leak” my political or ethical choices.

[KozmoNau7]

Activists are already well aware of the need for proper opsec.

Leave your phone at home, use a burner phone (and don't reuse it!), don't call any personal phone numbers,, don't use your normal accounts, don't blab on social media, and so on and so forth.

Basic stuff, but sometimes people do get careless.

[ryacko]

There should be a service where you can buy the aggregated information that advertising exchanges have on you, as well as any other shared details.

[kevingrahl]

Can someone else aside fom the data subject file a GDPR request to companies?

If so it would be easy to just request reports from companies and compile them to some friendlier format.