Just make the bond a % of the entity's revenue. Like that (apocryphal?) story about how Nokia CEO got speeding ticket of several million dollars in Finland, due to the ticket being a % of income.
Although I suppose a fixed % would limit how many claims you can file, which might be an issue for megacorporations who actually deal with lots of infringement -- although it would definitely reduce spurious claims.
Hmm, maybe coming up with a good law is actually hard.
Just a token fee like $5 would discourage spamming claims, though it does make fighting against re-uploads of the same content harder (the power balance isn't too bad for the play store where there is an entry fee for publishers as well).
Although I suppose a fixed % would limit how many claims you can file, which might be an issue for megacorporations who actually deal with lots of infringement -- although it would definitely reduce spurious claims.
Hmm, maybe coming up with a good law is actually hard.