Why would someone write some software as a service for themselve? You wouldn’t need to pay for it. It only becomes a service if somebody else wrote it and you pay for it on an ongoing basis. Your question does not make any sense. But let me address your actual point: If you want to find the next big idea, try to solve something you need yourself. Don’t fish for something somebody else already came up with.

While it might have been more effective, absorbed aluminium is linked to Alzheimer’s and other brain diseases.

That’s clearly a guy who didn’t make it as a police officer