Looking at https://www.chainalysis.com/chainalysis-reactor-certification, it costs some amount of money.
BTC needs to get the fungible part improved if you want to deal with fiat frontends.
Schnorr & Taproot will increase fungibility, but it's likely they'll mark all Bitcoin from Schnorr & Taproot (along with CoinJoin & MIxer) as suspicious/tainted coins
