Cancellation of early booking tours is not an exception, but a practice
My experience of cooperation with Accord tour company. On 10/26/2017, I purchased a tour https://www.akkord-tour.com.ua/tours/6985, departure date 12/23 (already at the time of purchase, we had seats at the end of the bus). As you understand, tickets to Lviv and back have been bought. But on December 7, 2017, Accord Tour announced the cancellation of the tour.