New iPhones are expensive, more than $1000. Yet most people who get them finance it through their cellular carrier, usually 2 year plans, so it's just $30-$50 tacked on to the monthly cellphone bill. So ... no one cares unless it's going to double their bill.
Let's say the RAMopocalypse and other AI-driven chip pressues drives everything up even more; let's say now-cheap TVs are now $2000 or $3000. No biggie. Your cellphone company can offer you an eSIM-locked TV with bundled network and services, on a 5 year plan with free lifetime service and replacement, adding just $30-$40 to your bill for 5 years. Maybe it will include something like Family Tracker Life360 Intercom as a value-add - talk to your children to/from the TV to/from any phone on your plan, anywhere, anytime. Safety, etc.
Same thing with your laptop, home IoT/security devices, etc.
If ATSC 3.0 dies and gives way to 5g Broadcast, it'll be another enabler for something like this.
That's when the real lock-in will happen.