Having recovered from a high demand religion (which can be considered a modern cult depending on the definition), cults are very different from corporations.

I feel like the best definition of a cult is any group that won't let you dissociate with your dignity intact. Most corporations are fine with that. Some aren't. So this suggests substantial differences.

I don't see that as a good definition of a cult

To be fair, it's a lived experience that I have found among other cult and high demand religion recoverers.

I believe that it's a common feature amongst a large portion of cults, but my scepticism arises at the use of it as a broad definition of what is or isn't one.

The same way you wouldn't say having a charismatic leader is the definition of what a cult is. It's certainly an aspect of most cults, but not the definition, nor unique to cults

That's okay. People have to draw lines to define things. I found the definition I provided above to be sufficient to my experience.