Hey there! I can write this answer in confidence because I have a few years of experience working with Jio Cinema. I started out my career with them and I don’t have too many complaints here as I had just started out, so it was more of a learning and earning experience for me.
I find the workplace pretty decent and yes, though the environment, policies, and experience may be different than its other subsidiaries, I found it to be safe and comfortable. Even on Glassdoor, Jio has an above-average rating of 3.7/5 for its workplace culture, salaries, and other pointers.
The work-life balance here is good and there are very less chances to get fired, as I have heard that they fire employees only if there is a strict policy issue or other fraud. But, like you said it definitely is a great place and opportunity to learn, grow, earn, and add to your overall experience.