If laws let companies do this, they will. Eventually unlocking your phone will look like a
https://en.wikipedia.org/wiki/Literacy_test. At 30 days, it has already passed the level of cancelling your subscription to The Economist and reached the obfuscation level of cancelling the average gym membership.
They'll just keep testing the limits until their analytics tell them that only 23 people made it through the process in the last year, then they'll shut it down for lack of use. Legally obligated, they'll replace the process with a promise that if you mail a newly purchased device to the company, they'll send you an unlocked version within about 3 months. Then, a year later, mail to that P.O. Box starts getting returned, and customer service claims that they're not aware of any mail-in program. The representative claims, honestly, that "we don't sell unlocked phones." You get escalated to a supervisor, and insist that they're legally required to unlock your phone. The supervisor apologizes to you, promises to get to the bottom of the training oversight that led to the escalation, and insists that you mail the device directly to his office and he will take care of you personally.
Only three people made it to the supervisor last year. Two of them never ended up sending in their phones, and for the one that did, the company accidentally sent another locked phone back and the customer failed to follow up.