What is the ruling on a Muslim investing in internet service companies that may be used to view immoral content, knowing that the majority of internet use may be for viewing bad content?

Since the matter is ambiguous to you, and this investment opens the door for the user to access both beneficial and harmful pages, and more than half of the subscribers use the harmful pages; then act upon the saying of the Prophet, peace and blessings be upon him: "Leave that which makes you doubt for that which does not make you doubt," and abandon this field, and seek another type of halal investment.