From looking at the source code they are using some mixture of these: https://github.com/Maykonn/js-detect-incognito-private-browsing-paywall https://github.co

From looking at the source code they are using some mixture of these: https://github.com/Maykonn/js-detect-incognito-private-browsing-paywall https://github.com/Maykonn/js-detect-incognito-private-brows... https://gist.github.com/matyasfodor/15e8863ab15baf4791a5fa4c748b64af https://gist.github.com/matyasfodor/15e8863ab15baf4791a5fa4c... And FYI in Chrome it's very easy to just F12, Application tab, Clear storage in the left menu and "Clear site data" at the bottom on the right to get past all these "you've read too much" blockers.