I have a club card account with a fake name on it. While they may track the purchase I make and know that a single person made them all, it's not attached to anything that is linked to me. My understanding is that they can't link credit card numbers to purchases, they can only use the number to run the transaction.
It's not great they track purchasing, but if it's not linked to me I don't really care that much.
I recently visited Seoul for the first time and learned about it while there. I only had time to briefly explore the first floor of building 21, unfortunately.
What I've found beautiful about -J is the host you jump through requires no privileges on the final host. Only my laptop has the SSH key to access my home server, not my cheap VPS.
And this allows me to have zero open ports on my home internet. I do a reverse tunnel to my VPS from my home server (in a FreeBSD jail), and that port is what my laptop client jumps through.
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