In theory, theres almost no limit to lean angle on these. In practice you just limit it to the edge of the tire. There's no traction after that anyway. When I say they steer like a motorcye one of the things I mean is that just like a motorcycle a given lean angle will describe a different arc depending on speed. If you find yourself overcooking a corner at max lean you just slow down - something easier said than done on a two wheeler.There will be a limitation on this, there can be only so much lean angle with two wheels up front. What happens when the corner exceeds this? I guess you crash.
Maybe it's fine, or maybe it's like riding a Harley, when you get to that maximum lean angle, it just doesn't go any further.
You could still lock the fronts and under steer right off the road. You could also theoretically high side the thing. The only thing you really couldn't do is tuck the front. So lots of ways to crash still. Although I imagine a stability control implementation to eliminate some of the risks would be relatively easy on one of these compared to a two wheeler.