the cause of this happening is not much different from what happened to a failed business in the real world. the lack of attractiveness of the coin, lack of financial support, and developers who do not have long-term planning are the causes of many failed coins on the market.
the first thing was developers capability creating and building qualifying product that have utility in crypto market. so far alot developers only creating funny project which is the main purpose only take money from unprofesional investors which is speculate their money into shitcoin. money could come itself if project running well, alot venture capital concern in this market and they look at good project.
After they gather huge funds from their investors, they are more likely to conclude their project and stop developing or updating it.
alot fake developers take a chance to rob our investors money by creating shit projects. we must becarefull when met this kind projects