Not when they’re shut down. Requiring a full tuition payment because “wouldn’t it be a shame if you lost your spot...” is extortionate.
"Keep paying us for the service we aren't giving you or else we'll blacklist you when service resumes."
I don't think you'll get a lot of people signing up for that.
The other risk than losing your spot is paying them and they go out of business anyway. So you're out both the cash and the service.