I estimate 99.9% of deleted posts were TOS violations.
In those rare cases, a review process exists for the .1% to be restored.
It's not difficult. A couple of clicks, and optional comment.
I have had my share of posts deleted. When I review them, I realize why they were deleted. A few confused me and Admin explained the TOS rule it broke.
Every once in a while a post was valid, and Admin restored it.
It probably took me longer to type this, than all my "request review" appeals since joining Ihub.
The point: TOS and processes work pretty well almost all the time.