IMO, hatchlings would be fine for quite some time. I've raised around 20 from hatching sizes (around 5") to 18" (within a year). It is actually easier to get food to these tiny guys in small tanks. So given a particular situation - say that they are hatchlings less than 2 years old (perhaps more realistically 14" or so), then I don't see a major issue. But not for long term care of them.
I think every tank and situation should be assessed on its own with specifics and discussion of the why's or why nots :yes: Ask particular questions such as "what are your plans in 2 years?" Heck, people may already have a larger tank for them and it is important to know this instead of just coming down with a "no way" straight answer, IMO.
So adult bamboos - no way, newly hatched juveniles? Might actually be a bit too spacious, IMO, to ensure adequate feeding.