However, it's something our team cares about. That's why 6 months ago, we started preparing to migrate to hcaptcha, even though removing reCaptcha wasn't the most pressing community demand. This work is on track to be completed in the next few weeks. We are sure that after we switch to hcaptcha, on the community voting forum, there will be a "do not use hcaptcha" suggestion, which will then start to collect votes. When it collects enough votes, we will duly allocate resources towards building our own captcha, because that's what it means to be a community driven company.
[1] https://protonmail.uservoice.com/forums/284483-protonmail/su...
> In our setup, reCaptcha is served from a sandboxed iframe, which prevents it from being able to interfere with our java script, so it does not pose a privacy or security risk.
You might perceive low user demand for this change because your users assume that you handle the privacy/security risks, and assume that the only issue is annoyance.
Any small leakage of data/activity/identity is unacceptable to those of us who know how this information can be taken advantage of, and choice Proton specifically to avoid that happening.