I wish Springer titles were available on SBO -- that would make the service worthwhile for me. As it stands, I consider it a good value, but only barely, and for many of the points you have raised.

That said, I can't fault them for having every publisher's catalog, since their focus seems to be on software and software-adjacent subjects. The publishers you mentioned have vast catalogs largely in areas outside of their sweet spot.

With regard to your account being corrupted, yikes -- I'm sorry that happened, and I can't say I'm super surprised. I've always found their playlists and "recently read" UI to be buggy to the point that I don't really bother much with it. For example, items "recently read" on their mobile app don't seem to sync with desktop/browser and vice versa.

I will also say that their recent embrace of dark patterns has been bumming me out -- aggressive marketing modals on login goading me into attending one of their live seminars, and breaking basic browser functionality (eg copy -- you can surprisingly copy text from inside books in SBO, but it will almost certainly be a bad time for you when you eventually try to paste it somewhere), among others.