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Regardless of the size, being successful means, is there enough money in the bank at the end of each month.

You're defining being sustainable. IMHO "successful" is a lot more relative and defined by expectations.

To jest, businesses can be successful without sustainability. Instagram definitely was.

If being successful means pumping an idea for acquisition.

Or if being successful means building something billions of people use on a regular basis

like, idk, nginx?