[gdhbcc]

They are having data about themselves collected without their consent. That is the harm.

[avalys]

In what way is that harmful to them?

[ramblerman]

With enough data you can segment for almost any group.

- Who is likely to vote Bernie?

- Who is gay?

- Who is gay, but not out?

- Who is cheating on their wife?

Etc etc..

If you can't see the potential for harm at both the individual level (think extortion) or political level of that kind of power I'm not sure what would convince you.

[JohnFen]

If data is collected about you without your consent, that collection is itself harm, because your rights and intent are being actively bypassed.

That's plenty harm enough all by itself.

[throwaheyy]

Are you being wilfully obtuse?