99% of those you see in videos are fake.
Very few of them are real, and that’s due to the psychic collective power of the xians there, and it’s never worked on amputees.
I come from a country where it’s famous for people to be “healed” by xian saints. However they never healed an amputee. There does seem to be truth to it though, as I know of a distant family member who claimed to be healed from cancer, apparently.
Enemy energies likely play a role here, but I think the majority of the reasons behind the real healings is the collective psychic manifestations of xian prayer energies as healing people with miracles is a big part of the xian psyche with a lot of stories on Jesus and apostles healing people. This eventually manifests as the healing of certain people at some times, and I think it’s more complex than that as sometimes these prayer energies might be favoured by planetary energies. Sometimes though no prayer to anybody will work as it’s likely fated for that sick person to die, xian energies seem to get easily overpowered by the planets.