ERC20 tokens by itself are not private as anyone can see everyone's balance. But a wrapped token for a privacy coin like Monero or Zcash can be anonymous when converted from the wrapped version. Does anything like this exist yet as of OCT 2020?
Yes, LOKI now available on UniswapProtocol
Swap wLOKI <-> USDT : https://uniswap.info/pair/0xf00fe8deba4fe94642846a91568f43bd93333ffb
Swap wLOKI <-> LOKI : https://wloki.chainflip.io