I see that now many projects are working on the principle of master nodes. Why is this just a new trend in the industry, or what exactly?
I think there is no trend here, just for many it is a convenient way to realize your ideas and provide the maximum amount of benefits both for yourself and for your users.
And what opportunities it will provide for many users who want to participate in this project, why should I be interested in it, for example?
Well, because it provides an opportunity to earn coins, if you own a master node, you can make a profit. This is a direct benefit to users.