I have continuously subscribed to TAS for forty years. They recently moved to using ZINIO for their digital deliver system. They have had a lot of difficulty moving to the digital world.
Over the last couple years I have spoke to the editor about this, since I did lots of technology platform migrations during my career and could tell the were struggling. I offered my help, but they had just hired a new consultant. so, I was really happy to see them move to a standard delivery system last year.
I am very sympathetic as the editors and audio reviewers don’t tend to be IT savvy, and then easily get led down a hazardous path (particularly when they have small budgets). TAS is a labor of love more than a real money making business. I still value their reviews greatly and always compare with Stereophile and HiFi+ and auditioning when possible to feel I understand the sonic characteristics of speakers or components.