Whats wrong with that? Computer companies do it all the time. They install a bank of memory or processing power, and if you pay, they switch it on. So two customers could have identical configurations, but one has more power than the other based on what they pay.
This practice has been going on for years. Why is it unethical if Tesla does it?
If you tell people upfront what you are doing, and they agree, I’ d say it is ethical; did Telsa?
Are the customers buying or leasing the computer EQ?
If they are leasing, the computer company owns what is in the box and can store upgrades for their own convenience in there. I don’t have a problem with that.