Yes, many sites have enabled blocking. But! There are some who didn't.)
Try these, although my guesses have already been confirmed: iFrame uses the data of the computer that opens the process, that is, if we both open the same process, we will see different IP and MAC addresses will be different. I had experience with this block in the context of Google Drive: I wanted to give access to the table only to those people who open the process, but no, their accounts in the browser should have access to the table, without this the block was not displayed.
1)
https://whoer.net/ru2)
https://pr-cy.ru/browser-details/