When they start growing close to the size of Google you could start worrying about this type of problem. With smaller players you could reach them easier if som

When they start growing close to the size of Google you could start worrying about this type of problem. With smaller players you could reach them easier if something happens, especially if they care about their customers. Ultimately nothing is guaranteed so backing up the data regularly is a good idea but that's not the only problem though, a lot of people's identity is tied to some services that if they stop functioning for them they're in a bit of a nightmare situation.