Agreed on not tested and my philosophy with legal grey areas is to avoid being part of the test case... However, these specific images come with their own EULA that says that you can not apply a different license to them (I checked because I would have also liked to have done so if it were allowed).
Just use this as they suggest for testing. Keep your data elsewhere and roll back/re-install every few months.
Just use this as they suggest for testing. Keep your data elsewhere and roll back/re-install every few months.