does mind switching [whether purposeful or something along the lines of freaky friday] count?

Ganguro, which I would argue, depending on the presentation, can be like bimbofication [when there is a before/after, gradation, or text in which sets a 'corruption' -like tone]

"natural" slavery? And similarly, will/spirit/Mindbreaking?

I can't speak for the community, but I think:

* Mind switching counts because somebody has to have control over the process (even when it's an "entity" like in Kokoro Connect), and therefore the minds.
* Ganguro is IMHO the asian bimbo. So just ganguro by itself is not MC (like just bimbo by itself isn't), but "ganguroification" most likely is.
* Willing, spontaneous submission is not MC to me, but "being forced to express honest willingness" certainly is. I think that's what you mean.

I'd have to agree with Stem_Cell, here. On pretty much all points.

I'll admit that I never thought of Ganguro as the asian version of bimbo. That's a very good way to put it, actually. It makes sense.

As for Mindbreak in particular? I'm not sure I'd consider it MC.
It would REALLY depend on the individual content in question. The only time I'd even begin to imagine it as MC would be if the Mindbreak led up to the mindbroken victim completely and willfully changing their tune from resistant to servile. It would almost be a mental corruption at that point, or a sort of psychological conditioning. But even then, I'd be hesitant to allow it on the site unless it had more than just mindbreak going for it that hinted toward it being MC.