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It means a system meant to privilege only those who pay.
This can also include systems that are made to ruin the experience of free users deliberately to impose the supremacy of the wallet.

It's commonly called pay-to-win at massive multiplayer online games.
Dude, you've spent like 400 bucks on this game so you can beat everyone who hasn't spent any money. Walletism at its finest!
by Samurai Pizza Cat March 23, 2016
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