> Isnt Chatgpt one of the most successful product of all time?

Lets assume that is true[1], all that says is that OpenAI has the best marketing of all time.

The best products are frequently not the highest-selling.

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[1] Depends on how you are measuring "success". If you're measuring it by revenue as a percentage of all products, it's probably not even in the top-ten.

Depends on what your metric is. If you care about profitability it could turn out to be the least successful product of all time.

By software they mean "application". Obviously chatgpt is software.

something selling a lot doesn't mean it's good. Is McDonald's good food? by some metrics of course it is. But if someone says McDonald's makes bad food, I know what they mean