You have to add the FUTO repo https://app.futo.org/fdroid/repo/
Cloudflare’s CAPTCHA is Turnstile. I’ve found it very useful. It doesn’t use pick the image or type the text, it’s just tick the box. You can even set it to invisible, then the user doesn’t need to even do that, the challenge is sent to the browser and is completed automatically.
https://developers.cloudflare.com/turnstile/
In terms of privacy, it’s is still Cloudflare, but at least it’s not intrusive to the user experience.
Yes, both SL and addy.io have the feature to enable/disable individual addresses.
I highly recommend crDroid. It’s super customizable and has a good battery life / performance ratio.
It’s just a really good product. I search for something and get the results I’m looking for. You don’t have to like it, but I like the product enough that I would take the time to recommend that others give it a go too.