They can be bought or they can buy other companies that are specialized in the same area for synergies. Also it is generally easier to manage smaller organizations so the underperforming half here could become a bit nimbler. Generally speaking it helps when people have some clear focus were it a company or life in general.

I'm not saying that these all are necessarily true here. Time will tell. And about the people, if the culture was bad before it would stay the same regardless. If it takes a turn for worse, then I guess it was inevitable either way.