Google is not breaking the (German) law here, it actually is your responsibility as a user to not spy on people. Failure to do so means up to three years in jail, for a first offender most likely a fine. And your device that you used to break the law might get confiscated.
The later was already the case when people used radar warner apps (banned on Germany as well) and lost their smartphone for that.
I didn’t check the actual law, always a good idea to do so.
So, §201 StGB actually covers both, it is forbidden to “aufnehmen” (record) as well as “mithören” (spy on). Bonus, its forbidden to cite transcription (im Wortlaut mitteilen).
Its an old law, going back to video cameras with magnetic tape and actually tapping a phone line. So it was used quite often, including the mentioned fake surveillance cameras, that didn’t record or even view anything but seemed to the public they did.
When dashcams became a thing people would be sentenced for using them. These days you can use dashcams, but never save for more than 24h or show the recording to anyone but the police/court.
I guess the law is a relict of living next door to Stasi, but its really just a guess of mine.
Illegal in Germany. You may not record conversations, if you try to enter something like that as evidence you’ll get punished as well.
I suspect there are many countries with laws like that, and if your phone actually disables the feature when you enter them or just let’s you hang to dry…
No need to, there is no fruit of the poisonous tree in German law. Police can strip search you in bright daylight on a crowded square for no reason - clearly illegal, bit what they find will be used to proscute you. The officers will be punished as well, at most with a stern talking to.