I'm sure you can justify why a button isn't as bad as spyware to yourself, but to anyone who puts up with neither, the parent comment makes sense without needing to 'equate' the two. They're both not things you'd put up with; and the 'sophie's choice' (yes, I saw the tag) joke would instead just be a response for a different platform.
This is comparing apples to oranges though: on one side we have a Unity lens that can be turned off and is restricted to searches, and on the other you have what I can only describe as a turnkey APT (RAT,RCE, process spy, device spy, keylogger, memory scraper) that cannot be switched off - how hard do you think it would be for a nation-state to 'enrich' and intercept/redirect this telemetry?
You lose a great deal of detail by intentionally avoiding the nuance of the situation: murder by starvation or Nitrogen asphyxiation is still death, but there is value in discussing the cruelty of persons who would choose one method over the other to kill, especially if one of them lets you opt-out.
Additionally, Ubuntu and Unity (host of the Amazon button) are not equivalent in any case. I use Ubuntu with KDE, others with XFCE or Gnome. So using Ubuntu in no way equates with putting up with scummy practices.
edit: expanded and split 2nd paragraph
The only thing left from the Amazon deal is that they have a referral link on the panel by default. Takes exactly two clicks to get rid of and does not do any form of telemetry.
Here are some other sources: http://www.omgubuntu.co.uk/2016/01/ubuntu-online-search-feat...
https://www.howtogeek.com/188589/5-things-you-need-to-know-a...