Even though there are other website builders I think you can take off by working closely in a community of people who are interested in your app and who find it useful. This can be a community on Reddit, Discord, or similar.

BTW when I try the demo and refresh the website, I get 404 page not found. See here https://api.youlaunch.app/02ed2ae6-bdb0-405a-b5ba-34919bb9e801632706030#

That’s a long sentence

Web apps should implement a charge per message that would be opt-in. Eg every message costs $1 to send and you get to keep 90% of the value. I’m sure it would help with the spam.