@phrawzty The closed-source version of the Hot Potato License is actually what most companies use internally. Most companies like this that I had the misfortune to work at would routinely bring up "who touched it last" as an argument for "who owns this?"
The result was that most engineers simply refused to work on anything except their own pet-project sandbox repos, lest they be held responsible for maintaining the monstrosities that awaited them in the hundreds of other microservice repos.