Large enterprise solutions usually have maintainers or source a company to do maintaining for them. Startups in today's world - not necessarily 'startups', but

Large enterprise solutions usually have maintainers or source a company to do maintaining for them. Startups in today's world - not necessarily 'startups', but also new products - move too fast for maintenance; by the time they pivot, the old stack is easier to replace with whatever new fancy system was sold to stakeholders. Also, most new software churned out today is built from some building blocks, usually community maintained, so no one is going to hire a developer to maintain <insert_fancy_open_source_framework_that_is_heavily_used_and_actively_maintained_by_the_community>.