Network effects go to a certain point yes. Then having people who hoarded chips is a detriment to the network. Because after that, people with actual resources like food or fuel will just invent their own chips to trade.
It won't get to that point, because no one wants to hoard too much. Hoarding chips endlessly is pointless. It's basically just a riskless buffer for future spending or investing. People will either spend or invest all extra chips. Rich people would own all the factories that produce food and fuel. They wouldn't sit on a pile of chips.
If someone is endlessly hoarding chips, it means that they are producing more than they are consuming. This would be positive for the economic network, but negative for the individual (because they are working more than needed).
If someone has a lot of chips, but isn't producing anything, they'll eventually lose their chips, because they have to spend them to stay alive.
Well fine. But now you're contradicting what you said two comments up:
> instead of hoarding food and fuel, you can hoard money and buy the things you need in the future.
Again, how do you know people won't just start trading with other chips? That will devalue the hoarded chips.
The argument started with paper thalers being a poor store of value. Casino chips were pitched as an alternative. And now here we are. Turns out the chips too are a poor store of value. Both can be true at the same time.