That would
1) increase prices as this requires staff
2) widen the attack surface for an enemy
3) lead to censorship, bias, etc.
Yep and some companies do that but mst just want their bottom line and the mostp rofitible is the one who lasts the longest especially when even humans make mistakes.
Once an AI can detect a scam with 100% certainty and 0% bias, then I would support your suggestion.
Interesting topic, I've seen computer scientists/linguistics experts suggest that if this happened with copyright law, the entire internet would be pageless (just an interesting thought - but this relies on human brains in the same culture following similar patterns).
IMO using a mixer isn't really worth it. I'd rather buy an anonymous altcoin and then convert back to BTC on a site that doen't require KYC but your money your choice
If you're serious about this:
funds to anonymise → exchange to buy anonymity coin → store offline and wait → different exchange to sell → mixer → either loop back to stages 2 to 4 or stop here.
You could also go to cold storage immediately after a mixer or send it to a different service (such as a TRUSTED mining website to buy a little hosting without kyc or an exchange to buy a common altcoin whos value shouldn't drop so much).
Sending to a classic non kyc'd exchange and exchanging it for altcoins can do well at hiding your tracks as well as sending it to a gambling site and trying to pull out a little more or a little less than what you put in is also not an awful choice (preferably more)...
I also wouldn't do the whole amount at once, even with anonymity coins if they have a change putting 100 DASH into an address and immediately pulling it out is just revealing your tracks to an extent and completely nullifies that task.