Voat seems to have four distinct kinds of groups, populated by two distinct kinds of people.
The groups are:
1. Groups that were kicked off Reddit for hate or questionable sex, went to voat, and got shut down there, too, or are still there but get very little activity.
An example of one that got shut down would be /v/jailbait.
An example of one that just gets very little activity would be /v/coontown. It goes months between posts.
2. Questionable sex groups that are somewhat active. /v/loli is an example.
3. Groups on neutral topics that get regular posts, like /v/technology or /v/funny or /v/science.
4. Hate groups with regular posts. (I assume these exist. I've never actually seen one, because I only go to voat when some disucssion elsewhere points to it, and that has never taken me to an active hate group).
The two kinds of people are:
1. People who came there for the hate groups.
2. People who came there for the sex groups.
The people who came there for the hate groups also post in the neutral groups, so the comments in /v/technology or /v/funny are full of hate stuff. The hate people seem to stay out of the sex groups.
I can't tell if the sex people also post in the neutral groups. My guess is that they probably do not.
The Voat groups for things like science and technology have nothing that sets them apart from the corresponding Reddit groups except the hate comments.
Sex is much easier to compartmentalize than hate. If you like something that most would find unacceptable sexually, there is no reason for that to come up when you participate in, say, a technology or science discussion. You can go to Voat for those sex groups that aren't allowed on Reddit, but stay on Reddit for everything else.
Hate group people, on the other hand, are more likely to let it leak out, and so get banned from neutral topic Reddit groups, and so have to go somewhere like Voat for those topics.