As far as i can tell Hytale doesnt seem to be on blockchain,...

As far as i can tell Hytale doesnt seem to be on blockchain, which is the main distinction between The Sandbox and Minecraft/Roblox.
In fact the sandbox is confident enough with this major difference, that they've even allowed their voxel editior to easily import creations directly into Minecraft. The theory is if Minecraft players use it, since they already have their creation made for the game they know and love with VoxEdit, while they're at it they may as well turn them into NFT's with the sandbox and make some money. Something that cant be done with minecraft, roblox or hytale. A good way to bring players over imo