It is actually more like Ethereum has proven itself over this few years and has been able to show how much the team is working to keep getting things done better. However, it makes sense to assume that since Ethereum seems more like the talk of the smart contract world, and a lot of projects using it without any issues, and easy to set up, then, it is normal for every other person to follow put. The community support is also huge and there is no doubt Ethereum has become the dominant smart contract platform.