I was shocked by those videos.
Honestly, I don't doubt that the WT would do all of those things to protect itself. They haven't been that way from the beginning. I suspect it's been a gradual descent into corruption.
It's probably a matter of protecting Jehovah's Organization - you'll lay down your life for it, so it's no big deal to do a little surveillance of a "dangerous apostate" for the brothers.
I watched an interesting program about two Scientologists who rose to a high level in that organization but decided to leave. They suffered a lot of similar harassment - obvious tails, for example.
My ex-husband was a Bethelite back in the early-mid 1970s, and I remember him telling me that the place was run more like a corporation than a religious organization. They disregarded scriptural principles left and right, most notably brotherly love. It's easy to see how easily they could get from there to the point they are now.
The Governing Body have fallen out of "the truth."