Everyone are trying to get rich and they believe crypto can give them that, it's why we even have many more developers in crypto space this days, beware though, not all of them are real blockchain experts, they are just here for the money
Everyone wants to make money, and creating your own cryptocurrency that will be bought is tantamount to a gold mine. For many projects, a breakthrough is enough so that later on from shit coins they can trade for quite a long time in all this variety of original "competitors". You can see the consequences of this by looking at the cryptocurrency chart with a list of all cryptocurrencies. 2/3 meaningless coins that have no purpose other than to bring money to their creators.