Same reason most infrastructure as a service companies exist. Setting up, maintaining, and scaling web socket messaging servers isn't my core business. Accord

Same reason most infrastructure as a service companies exist. Setting up, maintaining, and scaling web socket messaging servers isn't my core business. Accordingly I am happy to pay a reasonable fee to somebody like Pusher to have the problem go away. If real-time messaging is core/fundamental to your business, then you probably should run your own servers. Otherwise let somebody else deal with that bit of complexity and focus on the parts of your business that matter most.