Setting browser to incognito means the browser doesn't recognize who you are and doesn't announce that to sites. The rest of your examples are just scams, but browser example has a reasonable interpretation. There is no reasonable interpretation where "unlimited" means 20 GB a month, or "Full Self Driving" means "You have to be as focused on the road and have your hands on the wheel at every second as this isn't legally self driving".

I really don't understand the confusion.

Incognito prevents the browser from remembering the things you do locally to the browser itself. The browser, any browser, cannot control what the server does. The browser cannot block whatever javascript you have allowed it to run. All it can do is block javascript. You log into a server while in Incognito doesn't mean the server won't know you logged in (wtf?).

Icognito basically means your SO won't see your browser history, and that's about it.

But its the everydays Joe's fault for not knowing exactly how and when proffesionals with a phD and decades experience are misleading him

Complex things are rarely accurately defined in a word or two.

1984 has become reality (most predictions in the book), we need a new goal.

https://www.planetebook.com/1984/