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Presumably because other people can also utilize the “bug” they create intentionally but looking inadvertently. This backdoor however is activated by the private key only the attacker has so it’s airtight.

If they seemingly almost succeeded how many others have already done similar backdoor? Or was this actually just poking on things seeing if it was possible to inject this sort of behaviour?

Ed448 is orders of magnitude better NOBUS than hoping that nobody else stumbles over the zero-day you found.

Wild guess, but it could be that whoever was behind this was highly motivated but didn't have the skill required to find zerodays and didn't have the connections required to buy them (and distrusted the come one come all marketplaces I assume must exist).