I'm using Chrome with a JavaScript toggle button and have JavaScript toggled off for the Economist. This incidentally gets past the paywall.

I'm using brave browser and never see a paywall on economist.

So I guess the answer is to block JavaScript and cookies

Bypass Paywalls is the best I've found, works on Chrome and Firefox: https://github.com/iamadamdev/bypass-paywalls-chrome

Unpaywall works like a charm https://addons.mozilla.org/en-US/firefox/addon/unpaywall/