You can (at least on my my phone) separately configure the default browser.
Or don’t change your default browser at all and selectively share to URLCheck when you need.
I found URLCheck recently. It’s great!
If you’re interested in traps, you can add a honeypot to your robots.txt. It comes with some risk of blocking legitimate users, though.
Was going to make the same suggestion. You can try it out at https://tinylist.app
Not an app, and I haven’t really used it, but tinylist feels quite Google Keepy. You can add it to your home screen, but it doesn’t seem to work offline.
https://tinylist.app