For 4, I would always start with RF. You have fewer knobs to turn (aka degrees of freedom with which to hang yourself), but still get within spitting distance of XGBoost.
EDIT: disregard, I am an idiot, got my U-gaming companies confused
This is the same Ubisoft that recently tried altering the deal with developers. They are exploring new revenue streams, and I think this is just a preview of what is to come everywhere.
There are probably other use cases, but I only think of data warehouses for supporting batch/analytical workloads where latency is not a problem because the entire job takes minutes/hours to complete. In which case cold start does not significant.