That seems like a dumb way to measure success ("number of companies using it").Has Intel confirmed this? Do you have a link to it?
I measure the success of N3B by the number of companies using it. The rumors were that TSMC customers were waiting for N3E. If the rumors are true and only Apple uses N3B, I would consider N3B a failure.
I'd suggest that you view this more in terms of what the node provided for TSMC (in terms of learning, customer satisfaction/retention, and profit)...