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we are free at the moment, But planning to add a nominal subscription fee to access certain features in the premium plan along with freemium.

But will it be enough for you to maintain the system long term? For people who potentially could use your service this is very important.

yes should be more than enough to maintain the infra and team of four along with me :)

That's very good :) You might mention it on the site, since many people will have the same question.