There was maybe something about this a few weeks ago…
I had emailed Specialized about their position regarding warranty should a frame get damaged from use in a trainer assuming it was correctly installed. They were suitably vague in their response, but reading between the lines they wouldn’t replace it under warranty should there be an issue.
I also asked my dealer what his position would be, and they were of the view that you don’t really get frames being broken on trainers, but don’t be doing big out of the saddle sprint efforts.
The Road CC link above shows that some manufacturers are ok with trainer use, some not.
I don’t know anyone that has damaged a frame using it sensibly in a turbo.
The view I’ve formed is that if there is something that may cause my frame to fail, if it does so whilst on a trainer, I might be up for a hard time trying to get it replaced under warranty. Previously I was using my good bike, but I’ve decided not to use anything I can’t afford to replace on the trainer now.