Allowing to set tax rate by beneficiary allows to artificially increase rate without potentially being noticed

[TimDaub]

from discord:

However, @xiahua.eth you've opened a can of worms as: e.g. the tax beneficiary could also increase the tax rate significantly and bet on the current owner and tax payer to not notice. E.g. imagine you buy an NFT with 5% and a rather big collateral of 10 ETH. Now the tax beneficiary changes tax rate to 50% while you're on vacation or whatever to take all your ETH. It makes me wonder if changing the tax rate should be at all in the control of e.g. an individual or if it shouldn't e.g. be in the hand of a contract