They don't, they are all crazy priced which means the cloud providers don't really know what they are doing, forcing people to deploy their own FaaS layers insi

They don't, they are all crazy priced which means the cloud providers don't really know what they are doing, forcing people to deploy their own FaaS layers inside their cloud infra, which is a totally valid solution. Currently, FaaS platforms should be viewed like a cron. The majority of the benefit is if the fn is called in the low thousands per day.