They want “interesting problems” instead of just trying to create products that someone is willing to pay for.
After over two decades, despite all of its attempts, Google has yet to do anything successful that wasn’t advertising based.
No Android doesn’t count. It came out in the Oracle trial that Google had only made $24 billion in profit on Android from its inception until the beginning of the trial. I’m the meantime they pay Apple $8 billion a year to be the default search engine on iOS devices. Apple has madd more in mobile from Google than Google has made from Android.
What I called technically interesting is "working on a large scale product", which for you seems to have implied "work on a new problem", but for me it's exactly the opposite. The kinds of large scale projects I find the most technically interesting are long into their growth curve.
Personally, I find boring to be quite exciting - but perhaps not if the only thing you're looking at is the technical solution. Building a small business involves figuring out how to solve the mundane but important thing, but then you get to figure out how to sell it, how much to charge, how to do customer outreach, do support, turn the business into a repeatable process, etc. Building a business out of it is quite challenging and fun and the technical solution is frankly a small part of it.
Many solo-preneur types with technical backgrounds are way over-indexed on the technical aspect and want to treat it like their last technical job, but without a boss, which leads to a lot of disappointment and frustration.
i'm kinda in that situation now, and got to play all the roles, like how we increased our conversation ratio by 50% with me thinking like a sales person (hint, don't over-complicate your pricing page), and those things can get you exited for some time and the money also, i just don's see it long term. i would rather playing with something that i love to do.