My immediate feeling is this could skip all of the metric parts and lean more into "I will give you X% of revenue for Y amount of time" and get much the same ef

My immediate feeling is this could skip all of the metric parts and lean more into "I will give you X% of revenue for Y amount of time" and get much the same effect of providing motivation for outside devs contributing one-off work. The metrics approach only using revenue as a goal can only capture some parts of project work. A DB upgrade or new load balancer doesn't get you new signups, but it can critical to handling the next few thousand users.