alt Hacker Newsyes, we do, e.g. flixbus. and some others I think. Haven't been traveling for a while by bus around Austria. Apples/Oranges probably, but I do know vienna<->bratislava has like 3-4 different companies operating the same route with similar busses at similar times with different prices.
And talking about apples/oranges, let me add apples/bananas: Vienna to Budapest by train cost a lot when booking via öbb. And not a lot when booking via Regiojet.
The problem is the offers are all scattered around imho.
Yep, single tickets on Austrian ÖBB is not cheap at all without subscriptions or discounts.
Prices are good only if you use it regularly as a commuter via a yearly subscription (Klimaticket), but for one off trips, prices are more expensive than flying.