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When Baldur's Gate 3 came out, Steam's overall bandwidth consumption went from around 18 Tbps to 146 Tbps
(reddthat.com)
From Steam's self-published stats.
Baldur's Gate 3 could not be preloaded and weighed in at 125 gigabytes on disk, so when the game left Early Access at 11am US Eastern yesterday, Steam's bandwidth utilization shot up 8x over a span of 30 minutes. I know personally, I saw my download hit over 600 Mbps across a 1 Gbps fiber connection.
Kudos to the system engineers at Valve. It is mind-boggling that they have built infrastructure that robust.
No, it really would not be. As every time someone tries to pretend cryptocurrency is good for something, what you describe is more easily, more readily and more reliable solved without cryptocurrency.
As you say, just getting Steam wallet credits or, if we want to go full better-than-the-crypto-way, fiat currency, would work much much better.
Fair!