Question about guest collaborators

I've been using Lucidspark for just a few weeks now - love it, having a great time learning more about it. I have a few boards built now that I'm using for a variety of projects. One of them is a very large board - over 400 items on it, embedded software screens, concept diagrams etc. Very large. It is this project which finally prompted me to sign up to a "team" version of it, as I exceeded 300 items and basically could go no further. No problem, by that time I was convinced and had no problem signing up. So now all is good. Except that on a couple boards, a pretty small one and the large one I referenced, I invited a couple non-Lucid users in using the "anonymous collaborator" link. My understanding is that I can do that - bring other non-Lucid users in to look at, stick notes on and comment on the work I've done so I don't have to "pay" for each contributor to a board who likely wouldn't be a native Lucid user. I can get them into the board, but when they try to contribute, they get the same message I did - that there is over 300 objects and therefore until they upgrade they can't really contribute. And that happens even on the smaller boards (maybe a dozen items on it). Is this a bug? Or expected behavior? Because it seems that once I have a large project in play, and even though I'm paying for a "team of 3" who are always contributing, now I can't bring in an anonymous contributor to do more than look at it. If that's by design it really starts to degrade the value proposition. Just curious if anyone knows Lucid's position on this. I reached out to them but have not heard back yet. Thanks