It’s also worth pointing out that an unfriendly unsubscribe experience is also a major driver of spam complaints. Half of U.S. consumers say they’ve reported a brand’s emails as spam because they couldn’t easily opt out, according to our Adapting to Consumers’ New Definition of Spam report. So putting up opt-out barriers not only jeopardizes your legal compliance but can also hurt your deliverability as well.

This behaviour may affect one-click unsubscribe links. If clicking the link in an email automatically processes the unsubscribe, then Barracuda may unsubscribe users without their knowledge.

This behaviour may affect opt-in confirmation links.

If your python3 executable is named "python" instead of "python3" (this particularly appears to affect a number of Windows users), then you'll also need to modify the first line of git-filter-repo to replace "python3" with "python".

Also you will not be able to run any iOS apps anymore obviously.