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There are countless ways to implement autoplay. You apparently got lucky with one particular toolchain in one situation. Tor Browser is FF based and should not be extended by plugins (as that changes fingerprints), and TB plays whatever junk is on that page.
Have a look at how long Google has been unable to disable autoplay (2009).
The maker of Ungoogled Chromium made an autoplay blocker but it had so many failures he abandoned the project hoping Google would have the resources to tackle the problem.
I recently read a complaint about the opposite. Someone deleted their Proton account and their handle was made available 1 year later. They were rightfully angry because the next user would potentially start receiving mail from things like the original user’s bank. The new user could perform password resets on accounts where the original user had not yet changed the email address on file.