Lincoln had added the IP addresses of many companies to the database a long time ago.
However, his main goal was not to refuse orders—that was just a side matter.
After all, if this happened too frequently, they would eventually realize the problem.
Once they became aware of the issue, they would rush to order from their own homes, or even bypass the company's WiFi and use mobile data to place orders to circumvent the restriction.
Mavis was not truly omnipotent.
At least under Lincoln's constraint of "only using legal means," Mavis, with her limited computing power, was not all-powerful.
Of course, Lincoln was not a saint either. If someone really pushed him too far, he would be completely capable of flipping the table.
In any case, no one knew of Mavis's existence. Once the Mirage consoles sold 10 million units, and there were enough devices running concurrently, gathering distributed computing power to paralyze other servers, or even wipe them clean would be a piece of cake.