I think an uptime monitoring service will be my back up idea. It is like a pizza business, you can always
find people who want pizza and who will rave about your pizza. Dominos and Pizza Hut are not a problem.
Yeah, now that you say that it sounds a bit like starting a pizza restaurant I guess: hard work. Probably harder as the Pizza restaurant has physical presence and proximity, where as online, it is more democratic: we are all equally shouting into the void for attention.
That's a good analogy, there are some pieces of software that are used by so many people that there's always room for a slightly different spin on it. Look at notes apps for example.
You will have a hard time attracting customers as most common marketing channels are very saturated.
*unless you're going to approach it from a unique angle AND have access to a customer base; even then, it won't be a walk in the park