Yeah I think anyone who chooses to do business with Google at this point is taking a needless risk. I wouldn't trust them to continue to provide anything except perhaps the ad business.
Ahhhh it wasn't nice, but we at Echo54[0] had a plan/execution (6 months before the due date) to migrate to RabbitMQ (with MQTT Plugin) works way better and cheaper than GCP IoT service. We did all of that in less than 2 months.