It's undoubtedly bait and switch.

You have a company that portrays itself as the host of a project that relies on community contributions for maintenance, and all of a sudden that host unilaterally forces a licensing change where all users, including those who have been directly and indirectly contributing to maintain the project, are faced with an invoice-or-lawyer threat.

Yes, the source code is still available. Yes, anyone can pick up the last release and run with it. But it isn't business as usual anymore.

It disrupted day-to-day operations of all companies that have been using the software. Managers of all levels had to hold meetings, internal and across organizations. They had to ask lawyers questions and decide what to do and how to act based on their answers. People scrambled to react to this change.

To make matters worse, this change was overtly designed to extort money from it's users. There is no two ways around it. The first step is a sudden change in licensing terms, and expectedly the second step of sending in the lawyers to collect payments under threat of legal action.