Hello. Unfortunately, you did not submit the text that this question is related to, which makes it impossible for it to be answered. However, I will try to help you as best I can.
It is only possible to know what happened to Greyhound if the text your question is related to is read. However, it is likely that when competing companies began to emerge, Greyhound had established strategies to make it different from competitors, allowing customers to see it as the best option among competitors. For this, Greyhound may have lowered the prices of its products and services, or improved the quality of its products and services. To find out how this actually happened, you will need to read the text.
You will also need to read the text to find out if Greyhound has been favored or disfavored by heightened competition. However, we can say that if the changes that Greyhound made to be a competitive company, attracted more customers and increased profits, it means that it was favored by the competition. On the other hand, if these changes are able to attract customers and increase profits, it means that Greyhound has been undermined by the competition.