[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?

[craftinator]

Does taking photographs of a mountain harm it? Articulate your reasoning, rather and resorting to vague insinuations.

[austhrow743]

At some point in the reasoning chain you reach the bad thing that is bad because its intrinsically bad and if you try to reason more you'll just go in circles. Or you enter a philosophical debate of such depth that it's stupid to have it with internet strangers.

Drink driving is bad.

Why is that?

You might cause a crash.

Why is that bad?

People could die.

Why is that bad?

They'll be dead.

Why is that bad.

They don't get to exist any more.

Articulate your reasoning!!!!