So what is network effect?
A network effect is when each additional user adds value to the existing user base. So your users themselves are creating some value for the existing users.
So ,to understand better understand that google is the only one
“The IKEA Effect: Why We Value What We Build”
The IKEA Effect is a psychological phenomenon where people place higher value on products they partially create themselves. The name comes from IKEA, where customers assemble furniture — and end up lovin