That only tells you that it should be worth more than $200m to Amazon that this does not happen.
That is nothing different than a yearly tax on holding a trademark. There the obvious issue is that companies can just lie to pay less taxes.
Easy solution: let the market decide. You say it is worth X -> If that number is right you should be more than happy to sell for 100X. If you are not happy to sell for that, that means you cheated on your tax.
Inb4: But then big companies can just buy you for 100 times your value.
... yeah, and? That is already the case and for many companies (e.g. all of ycombinator funded startups) that is even a goal.
That is nothing different than a yearly tax on holding a trademark. There the obvious issue is that companies can just lie to pay less taxes.
Easy solution: let the market decide. You say it is worth X -> If that number is right you should be more than happy to sell for 100X. If you are not happy to sell for that, that means you cheated on your tax.
Inb4: But then big companies can just buy you for 100 times your value.
... yeah, and? That is already the case and for many companies (e.g. all of ycombinator funded startups) that is even a goal.