Yahoo will stop providing the ability to use its services using users' login information on other services, specifically with their Facebook account or Google.
For the registrant to obtain user πρόσβαση σε οποιαδήποτε service (e-mail, Flickr, etc.), he should register with Yahoo and reserve a new username and password. The reasons given by the service are the acceleration of the login process, the existence of a username and password to access all its services from any device, faster customer support and easier recovery of forgotten passwords.
It remains unclear - although it is considered expected - whether the practice will be adopted by all Yahoo Inc. sites. However, the expulsion of Google and Facebook accounts starts directly from the basketball service Tourney Pick'em, with users being notified via email that they would have to sign up for Yahoo to obtain a Yahoo ID or log in with a pre-existing one - note that in 2013 it recycled user IDs that had been inactive for 12 months, had to be in their account for more than a year.
Update: Following tech.in.gr's communication with Yahoo, its representative tells us that the company is working to improve the user experience, which includes the login process to the Yahoo service Sports Tourney Pick'Em. Currently, only users of this service are required to sign in with a Yahoo usename, but the practice will be extended to all users. By using a Yahoo username, access to all Yahoo services will be shared.
Finally, the company has not announced exactly when it will cease to exist choice sign-in through Facebook and Google accounts, however in the aforementioned announcement users are assured that their data will remain accessible after creating a Yahoo ID, despite the fact that in the past access was through Facebook or Google accounts.