Centralization goess against the ethos of www. It was supposed to desintermediate interactions yet we ended up with monopolies.
A very good contention. Goes to bolster opposition to any link tax.
Note that having to negotiate extra surcharge with news publishers would make online even harder for smaller, independent websites, and (relatively) easier for large platforms. A link tax incentivizes centralization.
And the current excuse of "only large platform" is just that - an excuse, easily changed with a stroke of a legislative pen, once the precedent of link tax is established.
So regardless of the egalitarian ethos of the Web, the natural result of leaving the environment to invent itself is that there will be one search engine that basically everybody uses, one social network that basically everybody uses (and that one network might change from generation to generation).