
One can be forgiven for constantly feeling a nagging fear that their personal information could be compromised from just having an account on a mainstream service or forum like Google or Reddit. At the same time these outlets develop ever more thorough methods of keeping registered users' account information secure, malicious elements from the Internet's darker corners innovate ways to exploit vulnerabilities in these systems and potentially reach what is behind them.
Anyone with any information posted on the Internet can fall victim to subtle tactics such as emails that compel readers to share their details while merely looking like official correspondence from reputed companies. Therefore, both the contents and the registration information of various online accounts can be compromised before the victim owning those accounts can piece together how their details might have been divulged to hackers.
To some extent, accounts that are no longer used by their owners might be less likely to be discovered and hacked into because they are unlikely to contain content that is relevant to the present. However, any data left within "defunct" accounts such as old photographs and old banking data can still result in some very unpleasant surprises for their owner at a much later date if they do get broken into. It would therefore be theoretically logical that the platforms in question would gradually delete accounts on their own to safeguard their owners' privacy, but this generally does not happen because keeping accounts' remnants where they are lets official analytics software derive profitable data from them. Furthermore, outright deletion of the account could technically allow the "identity" of its space to be claimed by a potential impostor.
The best way to safeguard any data that has been left over in an account that is no longer being used is to change the password and its associated security questions to something that bears no resemblance to the passwords and questions the former owner is using across their accounts on other websites. This at least ensures that one hacked account should not let the culprit access more of the owner's past accounts. For more information click here https://www.reddit.com/r/web_design/comments/dxbeoy/will_sites_like_google_facebook_reddit_etc_ever/.