I think the better question is will they be able to buy them all. Buying implies the other party is willing to sell.

Its true that this information will be harder to access if not indexed properly, but word of mouth is a good backup for that. I didn’t find lemmy from google, someone (non corporate entity) posted a link to it somewhere. Now, that ‘somewhere’ may be corporate controlled and ban certain links but I’d argue that will just split the internet into two (a corporate side and “free” side) with little cooperation between them and I don’t think anyone will be able to keep people from either side - as long as the internet remains neutral.

I think its just too hard to completely control information unless you are a nation state (and even then).