Your objective may have been different (the commits adds to your portfolio) or you may just have been a hobbyist but other than that, why would one be willing to sink hours!

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So what you are saying is that unless you have a million dollar idea it is unlikely that indie software dev to be sustainable

Any advice on how to contact them, just search for companies who could like my product and just mail them?

That is actually a very good suggestion, in fact I have also tried this, if any others are viewing this here are the two main drawbacks with such plans: firstly its a very good idea and companies have bots who just spam these creators so youtube has a policy where you can only view a limited number of creator emails in a day, secondly again cuz of the spam your mail might not get seen by these creators or ignored

Anyways I appreciate the suggestion, thx