It happens to all applications like that.
Remember CUSeeMe, ICQ, AOL Instant Messenger, Paltalk, ...
They start out pretty good then they rot. Something new comes along and then the cycle repeats. Right now people perceive Zoom works but 5 years from now we will be asking "How can Zoom be so bad?" and something new will come along.
It happens because instead of having multiple applications that can interoperate with each other where competition would lead to better applications, competition is based on two-sided markets that compete based on inertia.