I'd be very careful about trying to "resurrect" failed start-up ideas like this. Unless you're one of very few people, you can't effectively solve a problem yo

I'd be very careful about trying to "resurrect" failed start-up ideas like this. Unless you're one of very few people, you can't effectively solve a problem you don't have personally. If you try and things start to look like they're working, someone who actually has the problem and knows all the details can pop up and wipe you out. Also, the reasons why start-ups fail are not always obvious. In many cases, what appears to be a good idea really isn't for reasons that only the prior founders understand. Without exact knowledge of the past, you're very likely to fall into the same trap that killed the previous start-up.