There is a minefield of complexities around some vendors' proprietary software licensing depending on where you use it, exactly how many CPUs or cores are installed in the hardware, whether its on-premises in your cloud or on-premises at a hosting provider, whether remote desktop software is used, etc,
Yes with open source some more planning is needed to configure the various best of breed software to work together but you can scale with zero software cost and can use it wherever and whenever you want to. Your remote workers are free to install the same up to date software as the office users. No license audits to be done and no annual subscription increases to keep budgeting for.
See Surge in home working highlights Microsoft licensing issue: If you are not on subscription, working remotely is a premium feature
Customers on-premises with perpetual licences 'don't have a good story' for remote working