Yes, the local client part is clear. But for the server part to be self hosted, the vendor would need to know how to reach you / your device.

Currently, they only go "hey, I have a message for user "Justin “! Google, can you make sure they get it?”. And Google takes that message, figures out which backend server your phone is currently connected to, routes to that server, the server hands it to your phone, and then you get a nice ad about CandyCrush or whatever.

If you were to host your own server, there would be an additional layer of figuring out which backend this message needs to be routed to. And for that, every vendor would need to maintain a list of backend and which users / devices are using which. Or, a third party (Google?) would need to offer a service that does this part for the vendor.

This would technically be possible, but as far as I know is not a part of the current “standards” for push notifications.

How would that work? The provider / vendor of whatever app or service you are using would need to know that they need to contact that server to send a notification to your device.

Ich glaube das Geld ist eher für die Infrastruktur etc gedacht, denke nicht dass die meisten Leute denken, dass das die Autoren oder Moderatoren bekommen.

As I said “WITHOUT” any custom/special map. I can enter my home address as is and the search / navigation works as expected - same as it would for gmaps, apple maps, …

Works fine in Germany without any Special Maps

Sprinklerzentrale

Eh, kommt ja drauf an wie oft man druckt. Wenn man täglich 100 Seiten druckt ist das sicherlich relevant, aber wenn man 2 Mal im Monat ein Retourenlabel ausdruckt muss man sich hier denke ich keine Gedanken machen. Und genau dieser Anwendungsfall ist noch viel tödlicher für einen Inkjet, der dann jedes Mal halb eingetrocknet ist.