The goal of this system is too make faking license plates using a bit of black tape hard/impossible. So I have some trouble getting the point of Erik Spiekermann's comment.
I do not use catch-all addresses, but use a version of [domain]@mydomain.com buy adding new email addresses (aliases) in an automated way. I "remember" the used email addresses in two ways: 1) my mail server configuration contains a list of all aliases created in the past, 2) my password manager saves logins on top of that. The nice side effect is, that you keep track of all the sites you have ever created logins at.
That depends on your definition of "solution". The scheme protects you (to a certain degree) from automated creation of inter-site profiles. The reason is, only very few people employ (a variant of) this strategy, so trying to "deanonymize" is costly and usually not worth it economically.
"It is illegal to shoot down an aircraft in such a situation in Germany."
No! The Verfassungsgerichtshof ("supreme court") ruling, makes it illegal for the government to give an order to shoot down the airplane (i.e. to make a decision on actively killing some people to save others). Most lawyers, however, agree that the pilot of the nearby fighter jet would face none or minor legal consequences if deciding to shoot down such a rouge airplane. IANAL which is why I refer for details to the following German blog (by a well renowned judge): http://www.zeit.de/gesellschaft/zeitgeschehen/2016-10/ard-fe...
I am really worried about the security implications for addons like bitwarden, if mozilla is right about this. I hope that competent people will take a close look.