these fail for a variety of reasons. The dead simple answer is that people who are trying to sell these are doing it off of a gimmick because to truly do this

these fail for a variety of reasons. The dead simple answer is that people who are trying to sell these are doing it off of a gimmick because to truly do this as the commenter suggested is nearly impossible if you are trying to offer an actual solution. Compression often adds noise that is hard to capture, the patterns can change on model updates, you can easily update models to capture these sequences. It relies on both a dumb model and dumb consumer for this work.