Why did Irish monks leave Iceland after Norse settlers arrived?

According to early Icelandic historical sources, Irish hermits had begun sailing to Iceland during the 8th century in search of solitude, often referring to the island as Thule.1

When Norse settlers began arriving in the late 9th century, they found these Irish monks already present on the island. However, the monks soon departed because they were unwilling to share the country with the incoming Norse settlers, whom they viewed as heathens.1