Sure you can, you can also pirate Microsoft Office (the versions prior to the shittening). But companies don't want that, they just want to pay a few bucks per user per month to make it someone else's problem. Microsoft offers this service. Google offers this service. FOSS does not.

That's also why always-connected SaaS is winning - it makes more things the vendor's problem instead of the customer's problem. Provided that you maintain a good relationship with your vendor. A metal machining company doesn't want to hire an employee to manage a bespoke computer system, or even to replace computer parts or install Ethernet cabling in the building. They might do it, if it's the only good option, but they prefer it to just work without effort, even for more money.

Umm.. this feels like a better suited comment for another part of this thread. Federated Computer appears to offer the exact same service as OfficeEU - a SaaS/managed Nextcloud