The drive to use something as a host can be very week in CB clown fish. Wild clown fish that don't have a very strong drive to find a host, simply would not survive. This is not a trait that determines life or death in captivity.
I have a CB pair of Ocellaris that wouldn't use a host for well over a year. Granted, they didn't have their natural host. All they had was a couple of LTA's, but a wild pair would have been in the anemones in a short time. It took less than 24 hours for my wild caught GSM's to move into the same anemones.
Yes. Some of them are dumb enough to try using a tube anemone as a host. Many of them become food.