What kind of Android do you have? Are you sure you went through all the settings?
And, still, I can install LineageOS or other privacy-respecting systems on my phone. We don't have any custom firmware for an Echo or Alexa yet (to the best of my knowledge.)
The number of phones actually supported by lineageOS is a rounding error, unless you count unofficial incomplete builds by random untrusted people on some forum.
No matter how many damn Google Assistant settings I disable in how many fractal menus, it STILL "helpfully" pops up if I say out loud "ok google"!
Like, "heyy I noticed you're trying to talk to me though I'm disabled, would you like to enable me?"
Stop spying on me you piece of malware.