It's really more complicated than this. There are two things there that tend to work together building each other up at the expense of individuals. One is tec

It's really more complicated than this. There are two things there that tend to work together building each other up at the expense of individuals. One is technology allows things to scale massively if you insert enough money. The other is there are massive amounts of capital available for those that can spin a good enough story that said investors will get a return. These two things together tend to lead to a few dominate sites at the expense of all the others. Especially when it comes to social sites and the network effects from them. But it doesn't only affect social sites. In countries with strong IP laws like the US it leads to a few businesses that can raise capital to corner their markets by buying our or bullying any competitors leading to almost no competition.