The company I was working for at the time spent a not insignificant amount of money and effort migrating away from Oracle JDK when they first pulled this shit.

It was a B2B outfit, had maybe 30 customers running a dozen different products that the customers hosted themselves. The product was critical to business and the customers were large and part of critical infrastructure. Even a short outage would have made it into the news. What I'm saying is it wasn't a place where you could just hope for the best while migrating JVMs, everything needed to be tested and re-tested from every imaginable angle.

This was extremely expensive, but in the long run, it was still a lot cheaper than ponying up for oracle licensing costs.

I don't work there anymore, but I doubt they are repeating the process to migrate back, especially given how well OpenJDK works.