I think that if the government really wants to get you, they will find a way. Take the almost 70.000 BTC that were seized from the hacker Individual X a few days ago. It took years, but they did it. He used tumblers/mixers but was still caught in the end.
It's definitely possible to get caught, but definitely also possible to get away with it if you do things right. Tumbling/mixing your coins doesn't automatically mean that your coins are now untraceable(probably a huge misconception), as you could still fuck it up by doing things like re-joining coins and such.
Even though the coins have been broken down and then combined again, but I think if the government tries to trace it, I don't think it's a difficult thing. but sometimes we collide with the legal regulations established in each country, so that it cannot run according to personal desires
indeed it can certainly be traced, because the thing a Bitcoin hacker has to do is sell his Bitcoin and exchange it for fiat,
of course the bank is the last destination, even though their Bitcoin has been randomized,
but the traces will definitely be seen. hopefully the threat to bitcoin price due to hackers will disappear.