Figma is the one product I will not stop preaching about, you literally have to stop me before I start singing it's praises. For me it's made redundant illustrator, acrobat, indesign, PowerPoint and miro. I'm almost free from adobe jail.
I wish they would be specific about what exactly the waves are that synchronise. When they show wave diagrams, the source of the value is never described.
Part of a part of one of the cases you have there is to do with barrier to entry.
If a community has no barrier to entry, it can be vandalized for free.
The barrier could be the understanding it takes to navigate, a literal price, or knowledge of its existence.
Smaller communities speak in ways and on topics that outsiders don't understand, and so outsiders are deterred. As the community becomes larger, it becomes more general, and so outsiders have an easier time integrating. When a community takes a price, vandalism has a cost, which is often not worth paying. (it could be something as trivial as be in a place at a time, or buy roller blades).
Plus, there's definitely a tipping point beyond which it'll spiral outwards.
One of my writer friends accomplishes a similar workflow by just having a writing account on his laptop, where everything is disabled except a text editor.