[penagwin]

Because like 90% of the traffic is malicious. VPNs and proxies obviously change your exit IP, and people rotate through these as they do things like spam, make accounts, credential stuff, etc. This means they're burning through the IP ranges and getting them flagged.

If you're on a VPN with a fresh ASN and IP range you won't have any issues (until people start using it for other reasons).

If you wanted to "fix it" the dirty method, there's extensions for chrome/firefox/etc that will automatically submit your captcha to a captcha solving service and it costs some tiny amount.

tldr; Mischievous basically has to go through VPNs, and they rotate through IPs getting them flagged. You can join the dark side with a captcha solving service and extension, and there's some "solutions" like privacy pass you can try.