Bribes are not suitable for aligning financial incentives because they are illegal (both to solicit and to offer).

On the other hand, if a financial instrument exists which is coupled to a specific economic service, then no solicitation or offering step is necessary in order to align incentives between a provider and a supplier.

Also, note that this is not insider trading. Insider trading means that a trade was made after an event occurred but before that event was made public. In this case, the trade is made first, before the event occurred.

I thing the GP is not talking about literal bribes that are ilegal. The idea is that every time someone fills a feature request the maintainer replies with a link to a bitcoin address a price, and until the money is in that address the maintainer does not implement the feature.