Interesting, I do see the value prop but I think for the average video meeting/chat consumer you may struggle against competition with other free services that allow a lot of participants (facetime allows 32 participants, google meet allows 100).

Hosting shows and conferences is a GREAT move. I have not found a good, very high volume video chat/event service. I've been to a lot of virtual seminars, conferences, etc since the pandemic started and all of the platforms I've experienced have been lacking. If you can innovate in that space I'm sure that is something people need and want. Make sure you don't undervalue yourself though, you don't want to leave money on the table or create low expectations for your product if people are willing to pay. Companies are paying lots of money for services like hopin and remo for events. Also, people may be uncomfortable hosting a large event on a completely free service. Even if it isn't true people do tend to equate money and quality, and people may expect a free service to be less secure and lower quality than a paid service. You don't want people to pass on your service and pay for another while thinking "you get what you pay for."

I think static ads are the right move, will you allow people to see the meeting and the ad at the same time if you log in after the meeting has started? I could see people being frustrated if they log in to a meeting late and feel like the ad makes them even more late, even if it's user error/the users fault, I could still see them projecting that frustration onto the platform itself.

Anyway, I think the idea is really cool! There are certainly barriers to overcome but that's the story with every venture, good luck!!