Also the foo_bar method from v1 worked better so pull that back in

You joke, but when I was doing my start-up we made good money on the side from monitoring websites to detect when the designers had pushed regressions to the live site. We would keep track of change requests that were filed and resolved, then scripts would monitor the sites to see if any earlier changes had been backed out. (Getting the designers to use version control was considered to be in the "too hard" bucket. This was back in the mid 2000s.)

This is how to collect low to mid 5 figures a year doing bug bounties too

Its all about the regressions, not finding anything novel

If this isn't cosplay I'd be glad to know how you do so.