Always listening is somewhat preferable to 'Has such an accurate profile on you from the data that is available that these instances happen by pure coincidence'. That's way scarier and just as intrusive. At least with a listening device you can get rid of it.
Sad thing is, it's likely both.
I've said it a few times, but I feel like they could have Dr. Doom come in to kill Kang pretty easily. It'd set up a new big bad, introduce the Fox Verse, and even set him up as the leader of any potential Battleworld in the future.
Kang even before the allegations hasn't been received all that well. A soft-reset with Doom might make people excited again. Imo all mystique of the character was already ruined in the Multiverse of Madness post-credits. A FoxVerse Vs MCU battle movie would touch on Endgame levels of hype.