Single tenant app is also better from data security point of view: there's no way to make a mistake that allows to access someone else's data, if it resides in

Single tenant app is also better from data security point of view: there's no way to make a mistake that allows to access someone else's data, if it resides in a different database/object storage. On the other hand, single tenant app is more expensive to scale: memory footprint and caching layer are not shared between clients.