you're right, i spoke too broadly. systems utilizing RFID can be designed to enable tracking, but RFID implants themselves are not inherently privacy-averse.

if i set up a system at home, my implant would be useless in the context of any other system. i am not at risk of being tracked by unknown parties simply by virtue of having an implanted RFID chip.

If a few inches of fake fur[1] is enough to block it, I don't see how it can be tracked at a distance.

[1] (the video is loud) https://twitter.com/The_Sass_Hole/status/982519966225305600