Except in the case Vic illustrated, they were not torqued. Worse, we have folks who won't check them, because they might need to remove and replace the pretty torque seal.
You may know that, but I don't have enough information to make that determination. As far I know, someone claimed they were torqued, but operation, vibration or inadequate torque could result in the fastener coming loose. Indicator doesn't prevent loosening of fasteners; which I've already said.
Again, well...you know. As for tampering, seriously, in our context?
Now, that's a reasonable question and the one that should be asked - is it a viable use within "our context"? It is not "worthless stuff", but rather designed for work process and tampering indicator; I do not consider it a viable application for a private airplane. And if that is your point, I agree.
We don't have any stretch bolts on an RV, with the exception of Lycoming connecting rod bolts. AN bolt torque from the standard charts doesn't result in significant preload.
This is a bit of a rabbit trail from the OP's question, but while I'm glad you've defined one stressed fastener in an standard RV, there are others. Such as cylinder hold-down and crank case nuts, as they stretch too and highly recommended for single use only (the reason the nuts are a lower grade than the through bolts as replacing the nuts is less expensive).
I would also add that anytime you torque a fastener above standard torque for the size (see AC 43.13-1b for further guidance), you should consider the fastener (notably it's threading), stressed, stretched, and should be replaced. An example is AN4 bolts being torqued to 100 ft-lbs on brakes, a common item on RV's. The standard threshold torque for an AN4 bolt is 70 ft-lbs; while you can keep reusing the bolt and likely get away with multiple reuses, either it is stretching, or the nut threads are, and will eventually fail; it would certainly never pass Level 1 inspection scrutiny. If you need further proof, take an AN4 bolt, the longer the more evident over distance, and measure it with a caliper, then torque it to 100 ft-lbs through a solid chunk of metal into a grade 8 metal fastener, remove, and measure again. Keep repeating...it gets longer and the threads get more loose each time.
Another example is propeller hub bolts, either fixed or complex; most prop manufacturers specify replacement at removal. Another is engine mount bolts. Both of these examples are exposed to higher stress and are identified for torque above the standard threshold and should be used once. Re-torquing can lead to failure.
And my favorite...self locking nuts...check the torque on these each time you tighten one and note how the drag torque value drops off. Consider how inexpensive they are and how valuable you and your passengers are... then just replace the things.
However, there are many, many applications of stressed fasteners in the world and my comment is aimed at educating in general.