True, I understood that the userbase was more important to them as my extension code was already released under GPL open source license. I was concerned about the following:

1. It was a grey area if the Terms of Service allowed such transfers of Opera account.

2. I had many other extensions that were being distributed through the same Opera account.

3. My suggestion to them was that I would release a new version of the extension from my account that explicitly informs the user of the change of ownership, and also inform them to install the extension from the new owners Opera account. They weren't interested in that.