Could also be because recording calls without telling is highly illegal in a lot if not all of europe. There are still apps that can do that afaik

In most of the customer support calls I make, I speak up right after connecting that I'm recording the call for legal purposes while the IVR plays. It's a bit tricky for marketing calls received, but I try nonetheless.

In my country (UK) it is legal, so there is no reason for them really to disable that.

IIRC Google claimed something along the lines of "for your own privacy and security".

And yet they don't disable cameras that you can use to secretly record someone...