They don't say not to use them, just not to trust them, "when you can avoid it". That seems fair actually.

Like, "never trust a stranger" is dark because most people are strangers? It's not.

Sounds darker when you have taken the second half away: "when you can avoid it."

There are two arms to it inth ecase of hosting:

1. Not putting your eggs in one basket: have a tested backup/DR plan so if a host goes bad you can move easily.

2. Always remember that they have a bottom line, and it is more important to them than your bottom line. Any claim otherwise should be viewed with suspicion. Also if you are on a free (or just very cheap) tier you will be a lot less important than customers on higher tiers.