(link removed by moderator)
It's really strange to me. Now, you can't submit your links to Google indexing as we all used to earlier but now it could be a trouble for the webmasters that how can we submit our URL's to Google for indexing?
In the above article link that I shared tells that if you want to submit your webpage to Google indexing then you must have to log in with your own verified ownership Google's search console account linked with your website.
So it's a big issue to webmasters. And only Google has been done not by other search engines.
I thinks Google trying such things to stop spamming on Google search engine.