That is NOT called "involvement in the market".
The government has also seized a lot of illegal narcotics and drug money. That doesn't mean they are involved in drug trafficking market!

The actual "involvement" and the biggest is still El Salvador because the government has actually made an investment in bitcoin and they see it as an investment. What US government sees those bitcoin as is NOT an investment, it sees it as some valuable items seized from criminals that are waiting for the court order as the process completes to be auctioned and liquidated the moment the order comes. That order may come when bitcoin has crashed and they sell those nonetheless since as I said it is NOT an investment.