Unfortunately people who have rooted phones, who use nonstandard browsers are not more than 1% of users. It’s important that they exist, but the web is a massive platform. We can not let a tyranny of 1% of users steer the ship. The vast majority of users would benefit from this, if it really works.
However i could see that this tool would be abused by certain websites and prevent users from logging in if on a non standard browser, especially banks. Unfortunate but overall beneficial to the masses.
Edit: Apparently 5% of the time it intentionally omits the result so it can’t be used to block clients. Very reasonable solution.
Also turn on a VPN some time (a signal to Google et al. that you're trying to bypass content region-restrictions, or funnel mobile traffic through an ad-blocker) and you are basically guaranteed to see nothing but CAPTCHAs from the predominantly CloudFlare owned and operated Internet.
So yes, it's a big problem, but only if your web environment (tracking metadata) are not sufficiently "trusted" :D