None, they just ignored me.

But so far people seems to say that allowing "verified" bots already works to let updown.io through. Is it not the case for you? (https://updown.io/doc/known-issues-when-monitoring-a-cloudflare-protected-website)

I'll probably try sending another attempt this year (looks like they have a new form)

Applied first on June 2023 using their "legacy" form (only one available back then): no response since then.

Applied again on March 2024 using their new connected form: no response since then.

It doesn't look like they care much about my applications.

Although updown is not in the list, people who used cloudflare seem to say enabling "verified bots" worked to allow updown so 🤷‍♂️

I've never got any response from cloudflare, but it looks like updown is now in the verified list: https://radar.cloudflare.com/bots/directory/updown 🤷‍♂️