Right. People do care about privacy, in the EU and other jurisdictions; it's the US where users tend not to. It's better for everyone in this thread to simply stop generalizing about what "humans" and "people" or "laws" do; start talking by country or region or privacy regime. (Whether the laws are flouted is entirey another topic.)
As to smart-assistant usage, what we would really want to see is comparative numbers of current and new Alexa users, broken out by privacy region (US, EU, other Europe, Australia, Asia, ME, CALA, Africa).
(PS noone other than Amazon knows how many "active Alexa users" there are in a geo, since no third-party can audit Amazon's numbers, and "installed units" might simply mean "user bought an Alexa device at any pointsince 2014, it might be unused/disconnected/broken/sitting in a pile of junk/given away years ago. This is just like the games Linux vendors, Java and MSFT notoriously played with "licenses installed" even if that machine was wiped to install another OS, without ever activating the shipped OS).
"Amazon has sold more than 500 million Alexa-enabled devices" absolutely does not mean "there were at any point 500 million active Alexa users", and anyway most Alexa users have multiple devices in one house, so the theoretical peak devicecount was only ever 500m/n at most. I suspect the real peak was closer to 77m than 500m. But noone outside Amazon knows; there are only estimates. There is no Nielsen Research or Quantcast of Alexa devices, AFAIK. There are only the "77.2 million (Alexa) users globally" stat for number of users [0][1]. Not devicecount.
And as to whether privacy laws, warrant requests are being disregarded, blanket geofenced warrants, Ring syndication, yRoombas snooping on you, data fusion of that data with Kindle devices/phones and smart TV etc., it's a semantic debate whether that's "widespread privacy violations which US Congress is lobbied to turn a blind eye to" rather than "users aren't sophisticated enough to detect when laws are being violated". Imagine if we applied that thought process to bank robberies and whether they were adequately protecting your money: the onus being on the customer to constantly monitor your bank. (We don't need to because there are consumer and criminal laws governing banking).
Anyone with more time might care to look for estimates of number of households with active Alexas by geo/privacy region, and compare to privacy watchdog reports.
[0]: https://www.demandsage.com/voice-search-statistics/
[1]: https://keywordseverywhere.com/blog/voice-search-stats/