The only problem is exchanges are more sceptical to ownership assets versus currencies
The other issue that was raised is the desire to allow players to buy in-game currency on external exchanges, deposit it, and start playing. To need to take what they buy on an external exchange and then trade it again in-game adds friction and confusion. Already with the original M (=1/1m XMR) and CKG, new players were confused about "gold" not being the currency.
IMO, the currency should be the only token clearly visible and accessible to new players. This minimizes friction and confusion. In someone wants to invest in ownership of the game that is a very different action from wanting to play it.
In fact maybe the ownership entity should have another name altogether, like "Ancient World Games" or something. Again to minimize confusion for people who want to buy in and play.
Edit: what CrazyLoaf said ^
It just seems like you have a LOT of dead accounts in the game and since you want to get as much M to town as possible, this is another way to do it.
Dead accounts that stay dead just decrease supply and increase the value of the remaining tokens, including those owned by the town. Conversely if they don't stay dead it was successful marketing to bring players (back) to the game.
Another thing that may happen if you threaten to sweep inactive accounts is that people may come back just to dump, when they don't want to actively play right now but would have held for wait-and-see purposes if they aren't going to be zeroed out.
Passive holding, cold storage, etc. gives crypto tokens a lot of their value.