We have seen many SafeMoon holders suffer due to the big dumps from the whales. E.g., NCAT price dropped four times in just hours because a whale dumped and took nearly 500 BNB from the pool (and SAFEMOON case was 1771 BNB). The images below are one of the dumps.
So transactions (sell/buy and wallet transfer) that trade more than 0.05% of the total supply will be rejected. This will protect the price movement as well.
Furthermore, whales who make a transfer (between 2 wallets) larger than 0,05% of the total supply will be charged 2 BNB. These 2 BNBs go straight to the BNB reward poolin
This feature prevents pump-dump-existing whales because they can destroy the project.