All transactions above some amount trigger 0 dollar transactions within few minutes. It's a massive attack that has been going for some time. Just look at the block chain. Even if it happens one in a million transaction, it's still profitable and scammer makes money.
Until someone brought up the topic on altcoins discussion board, i just realized these are attacks on two famous blockchains (ETH & BSC). I think it's possible that the attack will occur on all prefix 0x networks.
https://bitcointalk.org/index.php?topic=5425576.0