I have not scaled so far. I believe, we just have to upgrade the license and pay the charges. I haven't had the need to scale my operation so far.

We use it on a regular basis, once or twice a week. 

Scalability is good as you can host webinars with hundreds of participants without any lagging. 

We've used it for a webinar that had 2,000 attendees, and it scaled to that. We've not gone past that amount of attendees.

The organizer has the ability to share their screen but unlike solutions such as Zoom, many people cannot share their screen at one time. It is limited to the organizers.

No.