I remember testing Corona back in the day as it was quite novel at the time--code your game in Lua and compile to multiple platforms. I think it's safe to assume that the increased competition from Unity, Godot and the plethora of other cross-platform game engines over the years led to a major reduction in paying CoronaSDK customers.

As a web developer myself, I found Phaser a more natural fit, since I was more comfortable with Javascript and was only making games as a hobby. Many independent professional game developers tend to stick with Unity or Unreal due to their large customer base and more feature-filled editors.