I'm armchair at best, but I think scrum is a management and organizational process, something to help communicate upwards instead of something that is best for a team. That said, some companies and teams need the structure. They compare with Whatsapp, which seems to me like a small, dedicated, driven team with ownership and complete control over their own application. In my experience with Scrum, it was a product owner and management layer operating outside of the team, sending work downwards to the scrum teams while the scrum teams communicated progress and the like upwards. Less ownership, more oversight, etc. The scrum teams were implementation teams, there to do what they are told to do instead of owning a product. Cogs in a wheel, whose individual components (and the whole cog) could be replaced, shifted around and moved without the layer above really needing to worry about it.