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Well no, there is still no passport app in EU or the US. It's not dying, but it's going to

There is a passport app that lets you clear US customs much more quickly: (no pre-approval needed, only US/Canada citizens are eligible at present)

But you still need to carry the paper passport as backup.

just to note you can also use it as a non-US citizen if you are arriving on a Visa waiver programme (ESTA)

Additionally, Legal Permanent Residents of the US can use it too.

It says "Returning Visa Waiver Program Applicants". What does "returning" mean in this context?

The US has had a self-service border crossing app for years. It is aimed at pleasure boaters and requires an in-person interview once a year to use.