I can promise you that I do NOT get the ads based on surreptitiously eavesdropped conversations (while not using my phone) as reported by SO many people.
I hear that all the time.
"The other day I was talking to my friend about lawnmowers, and suddenly I started getting ads for lawnmowers in my social media feeds!"
That has never ever happened to me. I'm "confident" because I deal ONLY in facts. And the FACT is I don't have those problems. If you have that shit turned on.... well... there ya go.
I have spent a fair bit of time going through ALL the settings on my new phone. Hours. Literally. There are MANY settings related to privacy (and the more apps you have the more you have to do to change the settings).
The "permissions" and privacy intrusions built into cell phones and apps are rampant, pervasive, and insidious. But they can be mitigated... with some effort.
If you honestly believe it's inevitable or insurmountable, then I'd bet you have just "accepted it," and that's a lot easier than going through the process of mitigating it. It's also assuages one's desire to justify that lack of effort by telling everyone else they're wasting their time doing it.
Lastly... if you have a "smart speaker" in your house... you've effectively planted a "bug" in your own home. IMHO, that's CRAZY. Your mileage may vary.