Earth is full of different types of people, some are tightly adhered to a centralized system which is there for many decades and some are loosely adhered to centralization so they understood the features of decentralization. Most people on earth use the internet and almost 70% to 80% of them are already using centralized platforms like this post will give you an idea. The Op has emerged with the same query that and related to yours so i hope it could benefit you.

You just asked the same query in an alternative way like why there is less adoption of decentralization and vast adoption of centralization. The answer still remains the same. for example, if you have a family business of a bakery, or of any cooking industry, and your elders are making dishes with some secret ingredients and you have adhered to use those ingredients so that the taste remains the same so that the consistent customers remain permanent customers.

Same way, governments, and authorities are like those elders who have made you to tightly hold the tradition of using the same ingredients and restrict you to think outside the box so that they can control you with no or fewer efforts. And that's what they are doing now, you must read this thread of Social media, now looking more for business than for socializing. which emphasizes the importance of a global village to control each and everything easily. As we can no doubt make transactions on the internet as a global village, but this global village also made it easy for authorities to control us and spectate us.