I suspect a lot of it comes down to your ISP. Like the original commentor I also frequently can’t pass CloudFlare turnstile when on Wifi, although refreshing the page a few times usually gets me through. Worst case on my phone’s hotspot I can much more consistently pass. It’s super annoying and combined with their recent DNS outage has totally ruined any respect I had for CloudFlare.

Interesting video on the subject: https://youtu.be/SasXJwyKkMI

How? I’ve been noticing buffering the last few days with 1080p60 videos and up even using the suggested app version in Revanced.