Yup. It's not an attack, just some consolidation.

The address in question is 1FoWyxwPXuj4C6abqwhjDWdz6D4PZgYRjA, which is known to belong to Binance. Each USDT transaction leaves behind 546 satoshi in dust, and so Binance seem to be currently consolidating hundreds of thousands of these. You can see pages and pages of unconfirmed transactions here: https://blockchair.com/bitcoin/address/1FoWyxwPXuj4C6abqwhjDWdz6D4PZgYRjA. Since each transaction is only consolidating in to 0.0007 BTC UTXOs, I would expect that once these are all confirmed they would sent out another batch (albeit a much smaller batch) of transactions to consolidate further. It's just Binance taking advantage of the current low fees. Not an attack by any means, and trivial for your transaction to overcome it all by using a fee higher than the absolute minimum.