Understood, but then again, why doesn't everyone else do it? Why would anyone buy ANY used amplifiers or effects pedals since any of them could be tampered with or user modded? Why, all of a sudden, after decades of people making and selling gear and people buying used gear, is there a need for goop? Why doesn't Bruce Egnater goop his modules, which would prevent people from stealing "his" ideas and tampering with them (which people obviously do)?
What is odd about this whole thing is that the MTS concept is largely based on knocking off other companies' stuff in the first place and so we have a whole business model that is based on trying to copy the ideas of others in some form or another. The way truly legitimate intellectual property is protected is via patents and the judicial system, not by covering things up with black goop. One could even argue that it's a lacking of transparency, covering up something that maybe is not really one's own ideas (not saying that is what is happening, just making a point). Why doesn't a Dyson vacuum cleaner have goop inside it? Because if it's truly unique intellectual property, it is protected via patents. Yes, Dyson is a big corporation now, but at one time, Dyson was just a guy tinkering in his basement or garage and, through his own ideas and the patent system, he grew into a major force within the vacuum cleaner market.
Whether it's a major company like Marshall or Fender or one of the many newer, smaller guys out there building amps and effects pedals, everything and everyone is susceptible.
Similar to the MTS concept but in the form of a pedal is the Wampler Black 65.
http://www.wamplerpedals.com/heritage/black-65.html
The Black 65 is intended emulate the sound of a vintage Fender amp. While clearly trying to benefit from the work of Leo Fender, the owner of the company developed the pedal himself, but there is no black goop inside it. Why not? Heck, someone could put their own black goop on a module to give the impression that it's a JF mod when it's not. I'm sure that "black goop" is not some form of "rocket science" and someone out there will be able to figure out how to remove and work around the goop and then re-goop. Perhaps that person will start a "how to" thread on some website. Their are never any true assurances for anyone.
If Leo Fender had put goop inside the Fender Bassman, then perhaps today, there would be no Marshall Amplifier company (since Marshall reverse engineered the Bassman in making the JTM).