I've been paying a premium subscription to Focumon (https://www.focumon.com/) for a year and a month. It's a small Pokémon themed productivity tool that I found promoted here on this site. The paid subscription doesn't really give you much, but is inexpensive and I want to support the creator.

Small web tools have some advantages that could make them sustainable as a business model. Off the top of my head, some of these are:

* Creators are way more reachable, they often get back to you directly when you send them feedback. Sometimes, even, you get to have longer conversations with them too.

* You have more impact on what the product evolves into. It's also likely that you get some minor features added if you ask for them.

* Smaller tools are able to resist against enshittification with less of an effort. Doesn't mean that it may not happen, of course.

If you're asking this because you want to create a small web tool, I'd say the best advice you could use is to make something you like, make it reliable, and be proactive in engaging with you clients / let them reach out easily, demonstrating that you can and will listen and care about their concerns.

And if you create something you're proud of and have value, feel more than welcome of posting it here!