Replaces the Google reCAPTCHA API's domain

[cherinyy]

Google provides Google reCAPTCHA endpoints via www.google.com by default. This means that Google reCAPTCHA is not available in some regions, such as the Chinese mainland.

So Google deploys the same endpoints at www.recaptcha.net.

www.recaptcha.net has access to servers in the Chinese mainland in addition to the regular global CDN. So it is a better choice than www.google.com.

[ctrlcctrlv]

I was at first quite unable to find documentation of this but the OP is not trying to insert their own domain

$ dig A recaptcha.net

; <<>> DiG 9.18.1-1ubuntu1.2-Ubuntu <<>> A recaptcha.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53499
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;recaptcha.net.			IN	A

;; ANSWER SECTION:
recaptcha.net.		178	IN	A	142.251.41.3

NetRange:       142.250.0.0 - 142.251.255.255
CIDR:           142.250.0.0/15
NetName:        GOOGLE
NetHandle:      NET-142-250-0-0-1
Parent:         NET142 (NET-142-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       AS15169
Organization:   Google LLC (GOGL)
RegDate:        2012-05-24
Updated:        2012-05-24
Ref:            https://rdap.arin.net/registry/ip/142.250.0.0

OrgName:        Google LLC
OrgId:          GOGL
Address:        1600 Amphitheatre Parkway
City:           Mountain View
StateProv:      CA
PostalCode:     94043
Country:        US
RegDate:        2000-03-30
Updated:        2019-10-31

But then I saw https://developers.google.com/recaptcha/docs/faq#can-i-use-recaptcha-globally

Approved.