Most colleges would do well to get this into their curriculum at some point: https://missing.csail.mit.edu/

>what the relative risks of adopting one database over another might be

Entire companies get that wrong. Those licensing terms are complex legalese a lot of the time. Databases are not trivial things. You always get new risks as more product features get added. It's very difficult to predict the future on that front and how your database(s) will handle those challenges.