I've been concerned about that in the past, but I have gotten over it for two main reasons.

First, the price of offering a game distribution service digitally has fallen quite a bit, to the point that it's probably a fraction of a percent of a game's cost even if no peer to peer solution is used.

Second, the loss of a major game service would be bad, but the counterpart is that most games don't really hold much value after a certain amount of time.

A lot of services also have plans for this if it happened, though whether that would work without a hitch is dubious.

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