You’ll need your own storage to backup before erasing and turning it in, but they probably know that and will factor that in for a fee.

“Rent X months, get an SSD with your backup for free when you cancel your subscription.”

They’ll likely try to upsell you on iCloud services as well. Your entire life will be digitized and uploaded into the cloud, onto some corporate computer somewhere.

My issue with this is that you can often get a cheap laptop used, and major cities often have libraries that rent laptops to residents, if needed. And paying your library is cheaper than paying Apple, plus the money goes to the local library.📚