There's an expression called ruling from the grave to reflect the difficulty of enforcing a contract after you are dead. The same principle applies as those frozen people are dead in every legal sense and practical sense and likely any biological sense.

I would be extremely motivated to revive them and promote reviving them because I would also want to be frozen and revived. I assume this would be even moreso the case if society develops reviving technology, and therefore knows it actually works.

Yet people, doctors and civilians, try to save people who are legally dead every day…