Earlier quoted context omitted.
There is no competition, it's just monopolies. It's been shown over and over that the first-mover advantage on the web is almost insurmountable because of the network effects.
Which is why Google was the first search engine ever, and before that people just banged rocks together in the general vicinity of phone lines, because any prior search engine would have had an insurmountable first-mover advantage that Google could not possibly have overcome?
I think we, as technologically included people, tend to overestimate how old the internet is to most people outside of maybe early email usage.
Also the implosion of companies (like Yahoo) is a factor here. If Yahoo hadn't been really stupid they would still be dominant - and it would have been hard to stop them.
Of course people can overtake when the leader throws the lead... but it's luck and also hard.