You're correct that when the next release (2.2) goes live in a few weeks, DB2 will no longer be one of the free services.
We don't get many requests for it, which is why it hasn't gotten the attention it needed to be working with 2.1.x. If you continue to use 2.1.x you still get all the services it supports, including the ones that are no longer free in 2.2.
Sorry for the inconvenience this has caused you. This was not intentional, just bad timing between our DB2 service not working properly and the introduction of the paid packages.