Care to elaborate?
(but also, as OP, Stripe will almost certainly not have any use for this)
Etherium itself is not a computer, that's marketing speak.
In other words, I can unilaterally and without permission deploy code to the Ethereum chain, at the price of "writing the code" and "paying the Ethereum fees to do so." And when I do that, the ENTIRE CHAIN must follow.
That's closer to "a computer" that just "a listing of optional scripts."
To host validator node you stake ETH which is serve as collateral in case your node misbehave, go offline, etc.
If specific validator cheats at any point and end up approving bogus data he'll be punished by loss of staked ETH and penalty grows with each attempt to cheat. If multiple validators commit the same bogus data they'll get even more severe punishment for coordinated attack on chain.
It doesn't take a supercomputer to host ETH node so there is absolutely no incentive to cheat unless you actual bad actor who is attempting 51% attack. And to perform said 50% attack you will need like $75-100B+ of ETH stacked since currently there is $150B of ETH stacked for Proof of Stake. So this kind of attack really doesn't make any financial sense.