Back then, some "cheap Chinese" Bluetooth earpieces were Class 1 - 100mw, right by your skull. Today the public is more aware of radiation issues (more wrongly aware - 100mw@2.4GHz doesn't cause any problems) so the earpieces are Class 3 - 1mw. The limit of a Class 3 device is "less than 10 meters" in clear air. If you turn around, so the signal has to go through your head, it's probably less than a meter. And if the phone is in your pants pocket, so the signal has to go through your skull and your body, that's far beyond the reach of the earpiece. It has nothing to do with Google.
You're comparing 2 totally different things. Why can't my Porsche get up to 120mph on my block? It's not the car, it's the length of the block. In your case it's not Google, it's the type of earpiece they make these days, due to popular demand. (Remember, a Class 1 device puts out as much power as a wifi router, and most people don't want something like that right at their head - wrongly, but that's the way most people feel.)