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CryptoKitties is pretty much a pump and dump to the cynical eye; however, if you ever wasted hours of your life playing Neopets as a kid, then you'll understand its appeal.

I have played several ETH card games.
Those cards are stored in my wallet is not wrong,
But the site is closed,
The ETH card in the wallet becomes a waste number,
It can no longer be used,
Also cannot transfer.
And even if the official has a huge cash flow,
It can also Short-selling assets with roll run.
So I think,
It is risky.
So I think,
They should,
Make the card more accountable,
Like as BTC of multiple books.

When any game shuts down, the assets in it disappear. With blockchain games, your assets continue on.

this is false

these blockchain collecting games are all the same,
hyperinflation kicks in from launch until little value is left then game site disappears

while the asset still exists after this it is worth 0