https://wccftech.com/valve-disables-steam-trading-transfers/

Valve has disabled trading and Steam marketplace transfers for CS: GO and Dota 2 items for Dutch players following prosecution threats from the Dutch Gaming Authority.

Earlier today we reported that the Dutch Gaming Authority will be checking whether publishers have made adjustments to its lootboxes in several games, on penalty of huge fines. The publishers were given the opportunity to make adjustments until today.