I conclude that our police simply do not have enough experts to follow up on something like this.
And that's why Chainalysis is trying to take over the space of forensic blockchain analysis. I have nothing against using their methods to catch criminals and whatnot, but it appears that some of their 'investigations' aren't really connected into some criminal activities. They literally peer into any transaction that they find interesting and connect all the dots, somehow lessening the anonymity of those people involved in the said transaction. Police intelligence divisions aren't really well versed in the said area just yet, but contracting Chainalysis and other blockchain analysis companies for forensic analyses of crimes involving cryptocurrencies isn't really good either.
It's all about likelihoods. So the analytics result is never 100% true, it might be 99% likely. And therefore many people will need analytics. E.g. if chainalysis sells their reports to the tax authorities and the tax authority comes to you accusing that you didn't pay all your bitcoin tax then you need to defense yourself if it's not true or only partly true. Then you need as well an expert statement saying the mentioned transactions could be have another meaning because it could be a payjoin transaction and the judge finally has to decide whether or not he'll deide against you if it's only 90% likely that the chainalysis report is saying the truth. The same could happen in criminal cases. I saw a lot of rubbish from analytics.