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I think initially we skipped collecting a fee on donations, because the user was doing a donation, so it felt weird to charge a fee.
However, the protocol isn't a liquidity provider for every pool, and needs to be compensated for the work it does to process the donation.
Without this, donations represent a DDOS attack, where the network could be flooded with cheap donations of a garbage token, and not have to pay the protocol to process them.