Google reCAPTCHA not working in China?

Question

Angular

As you know, Google services do not work in China, but I really want Google reCAPTCHA to work. I have a service like this:

import {Injectable, OnDestroy} from "@angular/core";
import {Observable} from "rxjs/Observable";
import {BehaviorSubject} from "rxjs/BehaviorSubject";
import {Router, NavigationEnd} from "@angular/router";
declare var grecaptcha: any;

@Injectable()
export class ReCaptchaDynamicLanguageLoaderService implements OnDestroy {

    ngOnDestroy(): void {
        ReCaptchaDynamicLanguageLoaderService.ready.next(null);
    }

    public ready: Observable<any>;
    public language: string;
    public langParam: string;
    private url = "https://www.recaptcha.net:443/recaptcha/";

    private static ready: BehaviorSubject<any> = new BehaviorSubject<any>(null);

    constructor(
        private router: Router
    ) {
        window["__recaptcha_api"] = this.url;
        this.ng2ReCaptchaLoaded();
        this.setLanguage();
        this.ready = ReCaptchaDynamicLanguageLoaderService.ready.asObservable();
    }

    public updateLanguage(newLang: string): void {
        this.language = newLang;
        ReCaptchaDynamicLanguageLoaderService.ready.next(null);
        this.init();
    }

    private ng2ReCaptchaLoaded(): void {
        window["ng2recaptchaloaded"] = () => {
            ReCaptchaDynamicLanguageLoaderService.ready.next(grecaptcha);
        };
    }

    public setLanguage(lang: string = null): void {
        if (lang) {
            if (lang !== this.language) {
                this.updateLanguage(lang);
            }
        } else {
            this.router.events
                .subscribe((event) => {
                    if (event instanceof NavigationEnd) {
                        this.language = event.url.substring(1, 3);
                        this.init();
                    }
                });
        }
    }

    private addScript(langParam: string): void  {
        let script: HTMLScriptElement = document.createElement("script") as HTMLScriptElement;
        script.innerHTML = "";
        script.src = `${this.url}api.js?render=explicit&onload=ng2recaptchaloaded${langParam}`;
        script.async = true;
        script.defer = true;
        document.head.appendChild(script);
    }

    private init(): void {
        let langParam: string = this.language
            ? "&hl=" + this.language
            : "";
        if (this.langParam !== langParam) {
            this.langParam = langParam;
            if (ReCaptchaDynamicLanguageLoaderService.ready) {
                let isActive: any = ReCaptchaDynamicLanguageLoaderService.ready.getValue();
                if (isActive) {
                    return;
                }
            }
            this.addScript(langParam);
        }
    }
}

Where I try to bypass the "great" Chinese firewall through https://www.recaptcha.net:443/recaptcha/
I get an error in the console:

VM791 recaptcha__en.js:218 Uncaught DOMException: Failed to construct 'Worker': Script at 'https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=v1523860362251' cannot be accessed from origin 'https://www.recaptcha.net'.
    at new Xm (https://www.gstatic.com/recaptcha/api2/v1523860362251/recaptcha__en.js:218:623)
    at new Ao (https://www.gstatic.com/recaptcha/api2/v1523860362251/recaptcha__en.js:247:433)
    at Object.init (https://www.gstatic.com/recaptcha/api2/v1523860362251/recaptcha__en.js:248:72)
    at https://www.recaptcha.net/recaptcha/api2/anchor?k=6LeIxAcTAAAAAJcZVRqyHh71UMIEGNQ_MXjiZKhI&co=aHR0cDovL2xvY2FsaG9zdDo1NjU5Nw..&hl=en&v=v1523860362251&size=normal&cb=gtaulfjyul46:197:29

I get an error in Google reCAPTCHA:

Please upgrade to a supported browser to get a reCAPTCHA challenge.

Alternatively if you think you are getting this page in error, please check your internet connection and reload.

Why is this happening to me?