I have never used the fake ones, but have read a few stories of clowns hosting in them, how often or easy this is I can't even guess.
I find it somewhat wrong also, to completely veer people away from experiencing something they might have great success with. Works for some and doesn't work for others..This is the beauty of a hobby right?
With mortality rates in the upper 90% for not even reaching a year in captivity, personally I find it hard to do anything but veer people away, especially those new in the hobby. Without a clear understanding of their proper husbandry yet, I would just prefer they stay in the ocean until their chances improve (especially through collection and shipping) to where they at least have a glimmer of hope for survival, and an opportunity for captive propagation without such a strain on the wild population.
I understand your "works for some, doesn't work for others" viewpoint, but I feel the failure rate throws the comparison far out of balance. And even though it is a "hobby" and I use the term very often myself, we are still dealing with living animals here.
Just my viewpoint, and I tend to be more conservative. Obviously, some people do have to try and keep anemones in order to unlock their needs, but in my experience those keeping them in earnest is a relatively small percentage compared to the many I see and speak with that buy one with a clownfish thinking they "need" it.