One of my friends randomly got a small amount of USDT.
They looked at the transaction history of the address that sent them the USDT and found tons of transfers to a bunch of address, each transfer containing less than 1 cent in USDT.
via The TRON Community on Reddit https://www.reddit.com/r/Tronix/comments/hmhgl6/possible_dusting_attack/
TRONIX is a MainNet token based on the TRON Protocol issued by TRON Foundation, known as TRX. TRX is the basic unit of accounts on the TRON blockchain. The value of all other tokens derives from that of TRON. TRX is also a natural medium currency for all TRC-based tokens.