The LN2 itself isn’t the problem.

It’s the appropriate container, handling equipment, PPE, and safety technique.

Unfortunately, as some of these things get cheaper you start attracting a different level of hobbyist who are less interested in learning proper handling technique and safety precautions. Not all of them, but enough that it becomes a problem.

I’ve seen this play out across a couple of my hobbies in the past decade. When things were hard to access, the people who put in the work to get there had an appreciation for doing it properly and being respectful of the environment and community. Once it becomes cheap enough you get a lot of weekend warriors trying to run through the process as fast as possible while seeing how many corners they can cut. Things get ugly.

I was mildly surprised when my university supplies office offered to sell some liquid nitrogen to me, no questions asked. Which was disconcerting for few reasons: I asked for dry ice, I lacked a dewar, and I would have to transport it on a subway. All they knew was that I was collecting supplies for a science demo. Granted, a demo using liquid nitrogen would be much more fun. It simply wasn't an option on short notice.