Multiparty collaboration tools require servers to rebroadcast each party's contribution to the other participants. Servers require hardware. Whether running open source or proprietary SW, the HW needs to exist. Who supplies the HW?

Truth be told, each party could multicast to every other party, eliminating the need for a server. But that requires a lot of bandwidth. Each party needs N! times the single link BW. Does not scale well on home networks. Again, pointing out the need for a (centralized) server, for which someone needs to provide.