I have been reading that many exchanges are using Chainalysis (etc.) to look at transactions, and refusing to exchange BTC (or even accept them). I also know that BitPay is using such blockchain analysis to NOT accept BTC that looked like they were mixed or otherwise have a "dubious" history.
This looks like it is going to be an issue, probably getting to be a bigger issue into the future.
If we define "fungible" as satoshis = satoshis, then it looks like that some satoshis are more equal than others. Does this mean that Bitcoin is no longer fungible?
This looks like a problem for BTC and possibly all of crypto, in that crypto NOW has / will have to be "proven" clean, else hard to exchange for fiat, other crypto, or even for large purchases?
Please discuss.