The keyboard with the best prediction and self learning was my (first smartphone) Sony Xperia Z5 from 2015. I only realized it was a Sony specific app later in life. (I didn't understand auto correction memes until I got a work phone with a google keyboard.) Sadly they don't offer it as a stand alone app. I would pay for it.
I have settled for FUTO Keyboard for now. Bevor that I used SwiftKey. (The Sony is still the only one where I did see contextual self-learning/prediction.)
How does the government know which token a ID card generated? The ID card itself generates (for each service a different one) and encrypts it. Not even the card reader can read it. It is a encrypted channel between the card and the ID-server for the site/service. The pseudonym function does not identify a person but a card.
The government doesn't know which card a token from a "pseudonym function" belongs to. The government can identify a person when the ID function was used, of course.
Again, it is a random token the card generates internally for each service. It is non transferable! If you get a new ID card, you can't use it login to whatever you used your old card for. (You would need something else... say an email :-) to tie the knot back to the old identity or whatever.) Which makes this function, the pseudonym function, very bad for random accounts (Edit: meaning longer lasting online identities like forums or whatever). I guess eaglemfo didn't knew.
It's more for like "yes, yes, I'm an adult, now give me this pr0n movie which I pay for with my anonym prepaid card" kind of deals.
I have a similar mail address pattern (ebay-534389@foo etc.) When I started 7 years ago. I opened my password safe and changed one account after another. If the old account received something I overlooked and I was still interested in it, I changed this address too. A year later and the old address receives nothing anymore.
Nothings stops me or you from changing it back.
Update: And yes, there are a million providers that provide a catch-all mechanism. Even some domain registrars provide catch-all forwarding.
I run my own mail server since 7 years. (OpenSMTPD and Dovecot for IMAP (NextCloud for contacts and calendar) on OpenBSD.)
Apart from rDNS and FCrDNS (which the connecting host has to have) I don't have a Spam filter (and never had). I create a new mail address for everything. (name-number@...) I have gotten like ~2 Spam mails.
(I still have my 25 year old GMX address. (I even have premium.) I use it for my providers in order not to create a chicken and egg problem.
Only my MX is public. Everything else is behind a VPN.)
I have settled for FUTO Keyboard for now. Bevor that I used SwiftKey. (The Sony is still the only one where I did see contextual self-learning/prediction.)