However, that doesn't justify getting greedy by charging $10/month for software that used to cost $100 one-off. It certainly doesn'y justify artificially tying a bit of hardware to software just so you can charge a subscription.
I don't know where everyone's getting these numbers from, but read the article carefully. The CEO never actually said they were planning a subscription mouse. Nilay Patel asked "could you ever imagine a subscription service" and she said "possibly" and they went on to discuss the concepts that might fall under such a scenario.
Any business that's going to stay in business needs to be brainstorming how their world is going to look like in 10 years so they don't go under because they're completely caught totally unaware by change. That's all they were doing and MacRumors went and wrote a clickbait article based on that exchange that we're all freaking out about now.