I know what you mean, I've been going back and forth with this. In some cases I've spelled out the entire acronym, like rarer acronyms, but with some common acronyms it's not worth it. For example, "S3" is "Simple Storage Service", and anybody who studies for AWS cert exams will learn that really fast, so it's not worth it to repeat it on every card. I think a nice solution would be hover tooltips to spell out acronyms, but it would take some work to get that done without breaking all the other functionality that's related to hovers.