Germany's FlixBus to Take on Greyhound in the United States
I don't know how Greyhound is still relevant.  Most of the time you can get comparable if not cheaper tickets on Amtrak, and it's an order of magnitude better experience than a greyhound bus.  I just did a sample from Chicago to SF, and it's 20 dollars cheaper on amtrak, and 1 hour faster.  That's leaving on Monday.I suppose there may be some rural routes where it's a good option, but I don't see it.