Just one example. They come in many forms/varieties.
Discussion
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Thanks for sharing @gary@`🥪AVERAGE_GARY🥪`! Unfortunately this isn't extremely common knowledge for the uninitiated so it is good to educate people that aren't web devs or in marketing.
As a minimal layer of protection, I use a browser extension on my PC to intercept and remove common tracking codes from common websites:
https://chromewebstore.google.com/detail/neat-url/jchobbjgibcahbheicfocecmhocglkco
You can also add your own codes to block everywhere or on specific sites.
You cant fully disable UTMs (everything after the "?") as javascript and the content of the page often relies on it to structure the page appropriately. One example is that on google, the query for the world "hello" is actually stored as a UTM for the code "q".
EX: https://www.google.com/search?q=hello
It would be so easy to write a plugin to fully disable them, but it would break so much of the functionality on many sites. Hence, the service that nostr:npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vg suggested of removing them before sending them to 3rd parties is still necessary - even with plugins like the one I mentioned as tracking codes change all the time.