TL ; DR - Agree with
@FLRifleman . You can be charged for window tint being on the car on lease return so if you do it, plan to remove it before lease return. No one will know (or care) about ceramic tint on a leased car.
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You can do both if you wish, just know that on a lease, the contract states you have to return the car in the condition you picked it up in, minus regular "wear and tear" (which is defined by tesla, not the person leasing the car).
Tint does not fall under "normal wear and tear" so you absolutely, positively, "can" be charged for tint remaining on your windows when you turn the car in, and since you can not buy the car at the end of the lease (currently), you cant plan to "do whatever you want and just buy the car at the end of the lease" either.
With the above being said, professional tint jobs are not something a regular car dealer tends to charge for, no idea if Tesla does. I got windows tinted on every leased BMW I had over 20 years (and was never charged for it on lease return) but I also always knew they could charge me, and Tesla doesnt have a history of leniency on lease returns.