Hey if you're cool with me using your hardrive to store data I have a bunch of chia coins that need mining. Its weird how getting somebody's permission before using their stuff is considered unnecessary.
Reminded me of when I first discovered that major browsers allow third party cookies by default. And thinking I can't believe they allow this massive privacy leak.
If you look back the at the original post I say "Hard drive" not the "localStorage object".
And they are indeed stored are your system and not the servers.
https://allaboutcookies.org/what-is-a-cookie-file#:~:text=In....
The argument these other commenters are trying to make hinges on the idea that the type of storage for cookies wouldn't work that well for crypto mining.
You're calling that argument nonsequitor and I don't think it is. It's immediately applicable to explaining the gap in your reasoning. That gap, for the record, being Cookies Storage == Crypto Mining.
Finally, let me give an example. "I own my house and my land so therefore I'm a sovereign citizen." That's a bad argument for largely the same reasons.
On top of that, using localStorage for storing large amounts of data rarely involves anything like a cookie warning because it's 100% client side unless manually sent back to the server. And even then, if you anonymize the data (i.e. you don't care who's storage you are using), you still don't technically need any warning.
All this to say: There is basically no relationship whatsoever between pervasive cookie warnings and the usage concerns you are voicing. Both are valid concerns, both are important stakes, but they have nothing to do with one-another.
So the cookie warnings have basically become the Prop-8 warnings of the internet, where they're so prevalent people just ignore them, but the cookie warnings are more annoying since they require active dismissal.