I saw a sign in the bathroom at a huge gas station that asked people to scan a QR code above the toilet to leave a restroom review.

I immediately thought, "No way." Then, "Why?"

It doesn't require us to create a account
It doesn't require us to download a app
We can just not provide a feedback at all

And since we dont have to wait for a waiter to bring us a menu thanks to QR code, we are fine with it

If I want freedom, I go and enjoy free time with those I do enjoy.
If I don't want annoying services, I just vote with my wallet.

Of course, this is not an answer for all the problems.
Technology should serve us.

For many occasions, when the people tell me that I need to scan QR code to see menu at the restaurant or do something similar.

I just tell them "I don't have a telephone„

And they often get confused.
Some of the places they get me bypass all their services just because they don't know what to do and is too much to handle.
I got to drove some buses for free, because the bus driver didn't know what to do.
I get interrogated on the airport, in a much less time, also because there is much less information to be extracted.

I wasn't bothered by email and spam after all, just simply telling them I don't have telephone number, email address or home address and they leave me alone.

Of course there was a time that that was me who was trying to get their service and I need to be compliant.
But that's very much depends on situation and what I need.