When some nations started to use the "seized" bitcoins they have, to keep it aside as a reserve, many other nations realized, they can have bitcoin AND not spend any money for it. This will of course help us too, because they will crack down on anyone who has illegally done anything with crypto, that way they can seize their crypto, mainly bitcoin.
This will incentives nations to be better at finding criminals, because they will have a chance to bolster up their treasury with all this money coming from seizing bitcoins. While some will also put some money into bitcoin as well, instead of just rely on the bad people. When you think of all of this, you end up with a better result and get great returns on the long run.
Thi is good if some countries are thinking about new way to get rich with taking Bitcoin from criminals and holding it as national savings like US. This could motivate governments to get better at catching cybercriminals since they could make much of money from seizing these digital assets. However relying only on this method might not be good long term plan. Some countries might also decide to just buy Bitcoin for their savings instead of only getting it from criminals.