Smartkey is the problem.
Every remote start I have ever heard of requires one of the key transponders to be buried in the car somewhere, and long story short, the remote start activates a read and energives the ignition and starter when activated.
With the Smart Key in the car, first issue is expense, then, the vehicle recognizes the key inside the car, and never 'sleeps'. The electrical system keeps a good part of the vehicle modules on, expecting a start soon, since the key is in there. Eventually, if left long enough, the car battery goes flat. (over a period of days). Even if it doesn't, the constant drain/power cycles will beat a battery quick.
I have a customer that complained his battery kept dying. He lives 6 hours from here. No issues found in system, happens again, check, no issues. After a very lengthy interview, a tiny detail - 'no one cares in town, we just leave our keys in the car all the time,' The vehicle would keep the modules awake since he stored the keys in the car. We couldn't fix that. He didn't like the idea of removing the keys from the car when parked for a week in the garage.