Boring Cash Cows

I really like the HN/Twitter/Indie Hacker posts about solo founders building a boring, simple product. It inspires me to look for an unsexy problem and come up with a simple solution. I've seen some other similar sites but wanted to make my own because I don't like annoying popups and I just want to see a list. There are no ads, no "feed algorithms", no tracking, and no AI. Just a simple list (not even paginated!). Take a look around and I'd be appreciative of your feedback!

(most are solo-founder, minimal marketing, boring solution spaces, profitable. although some have grown significantly since their humble beginnings)

It would be cool if you can provide insight into how they're making their money, how they got their start, etc. Kinda like https://boringcashcow.com/

Nice website, but there are quite a few businesses in there that I wouldn't categorise as boring or simple to execute/replicate.