If the startup is profitable and self sustain itself, does it count as success or failure?
To investors, whether an investment is a success or a failure is indeterminate till the company either goes out of business or returns the capital invested.
Is this considered as success? It is not an IPO or big acquisition. But, the investor can make money by selling their shares.
Is this something the investors consider doing?
It can mean "ramen profitable" or something slightly better (like it can pay the rent and the founders a small salary)
Either way, not good. You don't need a home run, but you need something that can "fly for itself""
Getting there is tough, most startups are like making a rock fly