The problem is that they're changing the license to something more restrictive and less open mid-stream. The clauses in the AGPL, ostensibly made to make things "more fair" result in a lot more needed bookkeeping and management of the resulting software. Utilizing a modified version means you have to provide source, and nearly every instance of bdb has modifications from the Oracle source to patch various behaviors, etc.

Furthermore, there are other, more open libraries that do what bdb does, yet don't have those restrictions. The breach of trust Oracle performed in adding more restrictions makes me not want to use this software in any circumstances, out of apprehension that they may provide more new "freedoms" in the future.