We open source every line of code we legally can at Distrust, and it has paid off in getting us work, even on forks, many many times.

Source code is cheaper than ever, so if you fail to open source first then an open source clone will be created, and your hard work will be irrelevant. Best to have the first open source mover advantage.

This move just told users you are selfish, and breaking the pay it forward chain of goodwill extended by all the developers of the open source libraries your code relies on.

You also just told everyone to park their content on a platform that now has a bus factor of 1, with no option to export and reimport to a compatible fork hosted elsewhere.

If your ability to make a living hinges on open source code like yours not existing, then you are already on too fragile ground to be sustainable, and this looks desperate and will just make more people leave.