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Google has put severe limits on the use of the Fetch Tool for submissions because they want to discourage its use by spammers....
We've had to drop the public submission feature, but we continue to welcome your submissions using the usual tool in Search Console and through sitemaps directly.
3:25 AM - Jul 25, 2018
It now looks like you need to be logged in to submit a URL either of these ways. The public URL tool is now 100% offline:
Google Search Console
To submit a URL to the Google to the Google index, either...
a) submit a sitemap or...
b) use our new URL Inspection tool.
I always thought that doing this will make google aware of it and cause it to send googlebot to check it out.
[offtopic] I remember the time where guys were submitting your sites to search engines, and made you pay for it [/offtopic]