Car pooling/sharing is supposed to be sharing, i.e. split the cost. If you charge every pessenger individually you're trying to make a profit, not sharing or pooling.
Since the government considers the existing public transport infrastructure worthwhile to keep (buses, taxis), it doesn't want non-dependable competition to undercut it. Non-dependable meaning that these services aren't guaranteed to have a schedule, or to even transport you, like a bus will.
Car pooling/sharing is supposed to be sharing, i.e. split the cost. If you charge every pessenger individually you're trying to make a profit, not sharing or pooling.
Since the government considers the existing public transport infrastructure worthwhile to keep (buses, taxis), it doesn't want non-dependable competition to undercut it. Non-dependable meaning that these services aren't guaranteed to have a schedule, or to even transport you, like a bus will.