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Must be what you are searching and reading about as I have not seen an upgrade button for a while.

Maybe you have something(like malware) in your browser causing this.

Anyways this is off topic but there are work arounds for the site you mentioned and I believe you can even google how to do it ;)

Medium only hide content after you have read several(I don't know the number) of their articles, that's why you didn't see the "upgrade" button.

I know how to work around, but that's not the topic I'm asking.

As for the topic your asking about. I say Google should not remove results, especially if your only issue is a paywall.

Here is some info regarding paywalls and Google.

And just for you I will give you a nice Google Operand Tip

Try this in your search:

"What you're searching for -site:medium.com"

Hope you find that answer more satisfying.

You still don't understand. It's not a StackOverflow-like question to resolve an issue. It's a discussion.