Yes, my son tried Zwift once or twice in 2019, then my wife got on his case about being lazy now he’s in there every other day 
I have him set up next to me with a dumb trainer and my backup power meter pedals. Basically I’m taking the approach of leaving him to it, encourage him when he’s come out of the cave, give him a tip maybe once every few weeks.
As @wysbf2 said, Zwift have him a free account in Jan 2019 Which took a little while, and you have to renew it annually which took another couple of days, I didn’t subscribe myself until Dec 2019.