Confiscation implies it is unwanted inflation, when you use Monero you agree that the use comes with it inflation TO PAY MINERS to do the WORK to SECURE the NETWORK so that can hardly be called confiscation. And if it can then Bitcoin also has confiscation until 2140, since Bitcoin DOES HAVE INFLATION for the next 114 YEARS!
Discussion
The problem is that a hidden inflation bug occurs.
Why do you think Monero's design wasn't considered in Liquid?
Or why has no one considered a drivechain with Monero's properties?
Or running Monero on an L2 with BitVM?
It is more complicated to verify supply because of the private nature but not impossible. The emission schedule and block rewards can be verified. At the end of the day transparency and lack there of has different risks and trade offs. Which is why I use both not just one or the other.