My thought is I'm sure of what I'm doing with my body. Swallowing the tube is not more different than eating a chocolate bar...
I didn't talk about LMA or other breathing tube, witch, I think they are much more dangerous than a feeding tube.
I don't pretend to involve anybody in a such activity, but just share my experience. I never say there is no danger, but I don't think there is something more or less dangerous than playing with electro, deep insertions, or lot's of other "play" fet'players like. I don't judge what everybody does... If that's not for me, I don't, either I try. If I don't enjoy I stop 😉
If I talk about unsafe experience, I try to always inform of the danger... It's a long time I practice, had some bad experiences, and, thankfully, had lots of good one, despite they are pretty too kinky for some of us !
So, one more time, if you're not *really* sure of what you're doing, don't ! otherwise, accept all consequence. We are adults, so we act as such.