I recall that in some cases, users set up their MyOpera accounts using eMail addresses that later expired or were abandoned, so those users never received the closure-notification eMails

True, but it makes me think how important that data was for those users.

I mean, if I had important personal material stored with someone, I would make sure that they have ways to contact me if needed.

Although my current Opera name is similar to my name back then it's a real disappointment that any company can and does purge those accounts

They warned every user by e-mail about 'My Opera' being closed and ,if I remember correctly, also provided a way to download some data.

...

I recall that in some cases, users set up their MyOpera accounts using eMail addresses that later expired or were abandoned, so those users never received the closure-notification eMails. On the other hand, those users probably weren't very active in the first place or they would have seen all the Opera messages and rampant, emotional forum postings discussing the MyOpera closure prior to it happening. I do recall that exit/migration paths were discussed and suggested ahead of time for those having blogs, photos, and such that they wanted to preserve.

Although my current Opera name is similar to my name back then it's a real disappointment that any company can and does purge those accounts

They warned every user by e-mail about 'My Opera' being closed and ,if I remember correctly, also provided a way to download some data.

With "the cloud" storage these days it doesn't seem to me that those accounts needed to be discarded.

I guess they couldn't keep those accounts after the service have been ended, due to legal reasons.

Even if they could, it would cost them resources.

Anyway, I think it's not a discussion for Forum Feedback.

Although my current Opera name is similar to my name back then it's a real disappointment that any company can and does purge those accounts. With "the cloud" storage these days it doesn't seem to me that those accounts needed to be discarded. Just my two cents.

One question was about Opera back around 2006 or before. I had a user name and posted in what might have been blogs but it seems that Opera may have tossed all of those old account because I can't find them and wouldn't know how to search for them in this new form.

MyOpera?

There's this Web Archive. But for that you had better have a URL.
Well, MyOpera's search does seem to work somehow there, but one will only be able to find stuff if it's been archived/preserved.

Note: If the link doesn't work, add your user-name at the end of it.