Always the rows about some kind of BS that fragments, fractures, and defuses the efforts into pet projects instead of ever actually being a viable alternative for the majority of people to corporate offerings.
The hardest thing about any effort that is two or more people is the interpersonal, coordination, consensus, and organization aspects. Everything else is easy in comparison.
How hard a sell that is depends heavily on how much that person values their time. I know people who are experts in their field, who have had their with-source Wikipedia edits reverted to incorrect or misleading information by people who have more time to argue online than they do.
The hardest thing about any effort that is two or more people is the interpersonal, coordination, consensus, and organization aspects. Everything else is easy in comparison.