I'm on a similar path. Out of curiosity, business-wise, where are you aiming long-term? When feasible, will you expand team, or would you rather stay solo? Would you potentially take investment, or rather stay bootstrapped? Why/why not?
I'm planning on keeping it as a "two hours before work" thing. I try to document everything, and I started a YouTube channel with support videos to keep the support load low.
I'm happy with where things are, I have a full-time job I love, and the challenge of shipping something valuable in the two hours I have before work is extra fun. I still see myself doing this, bootstrapped and solo in 10 years time.
I tried taking one day off per week to focus on my projects full-time a couple years back, I didn't manage to accomplish much more. Maybe I'm more principled now, but I doubt it.
Sorry to be 'that guy' but is this an 'ultimately reliable service' for 'critical monitoring' or a lifestyle business that you run on the side? Because your marketing is saying both.
Also, when did companies become so okay with their full-time employees having their own businesses? I worked for both a hosting provider and a large mainframe manufacturer and if I'd have had any sort of side business taking up my time that would always have been a contract violation due to conflict of interest. Let alone a business that relies on the services provided by a direct competitor...
The awesome thing about software is that you don't actually need a human there to supervise software checking a website five million times per week.
I have built a self-healing system with observability in place to catch and page me when there are issues that can't fix themselves - it works quite well.
I can't speak to your personal experience, but I've never had a problem with an employer and running my own business. The idea that a single employee even shows up on the radar as a competitor to a multi-billion dollar corporation makes me laugh though.