I don't know about Apple but Google used to make a little tone that let you know that it was listening to you. It doesn't do that anymore. Now it just shows a little green light which, if you're not looking directly at the phone you won't see.

And it was pretty frequent when Google's voice Assistant would randomly activate and I'd hear that little tone and I would have to turn it off so it wouldn't sit there listening to my conversation. But now you don't have that option, now if you miss that little light everything you say is recorded.

Fuck these services. I have permanently disabled both my phones 's Google Assistant and the Nest speaker I bought. Yes, it's less convenient. But the fact of the matter is that these companies aren't interested in making a service that is useful to you they just want to collect data on everything you do so they can sell it. And to be clear, I was fine with them collecting data on stuff that I actively participated in, it's the price I was willing to pay. But for them to pull this shady ass shit of removing the audible notification is just garbage.