I was around in the days of large one of licensed and ongoing support. There is no way they would want software without that ongoing support. Not just helpdesk but a team behind that fixing bugs and responsible for the software.

However that does open space for free software plus pay for supporting it. Good example would be WPEngine maybe. You can easily move from them to someone else if you use WP. Not so easy to move from Jira to something else because then the software changes.