> I can't imagine the vendor lock in of that.... You have the source, but it is in such a state that no human can maintain it?

It’s much worse than that.

What happens when the erroneous output caused by model blind spots gets fed back into the model?

Those blind spots get reinforced.

Doesn’t matter how small that error rate is (and it’s not small). The errors will compound.

Vendor lock-in won’t matter because it will simply stop working/become totally unrecoverable.