Hi. ISTA is, I believe, definitely a cult. Some articles came out recently:

1. [onlysky.media]

2. [www.rnz.co.nz]

3. [onlysky.media]

There is a large number of complaints made against ISTA by many people and mainly young women. It's really terrible. I have friends that were harmed.
There is a dedicated Facebook group against ISTA with hundreds of people in it.

I would love to connect and share information.