Hey @m.yankovskyyuk,
Great questions—happy to clarify!
First, I should note that based on your use case here (using the Web SDK and authenticating via JWT), you do not need to submit your app for review by our team, and this can be a private app.
Second, in regards to limits on the Web SDK, Zoom rate limits apply only to API requests and are applied on an account level. If you have several different apps under your account, the credentials associated with each of these will all count towards your rate limits.
In regards to the Web SDK, this can hold up to 1000 attendees if you have the right plan—if you have a Pro account, it holds up to 100 participants by default unless you buy a Meeting 500 add-on. Business accounts can hold up to 300 participants by default. You can see our plan capacities here:
Regarding deployment, you should be able to deploy your web app (Web SDK) to multiple environments using the same credentials. This should not require separate Zoom accounts.
I hope this helps! Let me know if there are still questions.
Best,
Will