Meditation is a pretty broad term encompassing many different activities/intentions (though they all look pretty similar from the outside). In the studies I’ve read on the adverse effects of meditation, the style has a major influence. Due to historical accidents, vipassana is a common style in the West - I find this mind blowing, since it is probably the most likely to cause adverse effects.

As a long time meditator, my experience with vipassana is that it is the hardcore path, for those willing to risk crashing and burning to get to enlightenment faster. Techniques like mettā, tonglen, or dzogchen seem to be ~5-10x less likely to be associated with a psychotic event - which at that point, seems like it could just be about prior history [1]. It's worth mentioning that Britton, the academic meditation critic in the article is a co-author of this paper.

[1] https://journals.plos.org/plosone/article?id=10.1371/journal...