Flixbus bought MeinFernBus a couple of years ago, followed by the Postbus passenger service, which was a major consolidation of the market.

I'm not sure if the prices have gone up much in the last year despite the drop in bus competition. I always had the impression that the inter-city buses were competing pretty hard against non-consumption, and Mitfahrgelegenheit services like BlaBlaCar. There were a lot of highspeed 1:40 trips between Berlin and Hamburg that simply weren't happening on Deutsche Bahn for 60-110€ but made sense as 3 hour trips for 9-20€. Bus liberalization also seemed to result in DB introducing more slow trains that could compete on price on popular routes. Market liberalization has been a big mobility win for the young and less wealthy.