I’m not sure what the cheaper subscription you’re referring to is.
Only “Premium Connectivity” aka the internet data plan (streaming media, live traffic, and live sentry video feeds) is exclusively a subscription.
Tesla has always offered the option purchase the Full Self Driving upgrade outright. The option to subscribe monthly to FSD was added later.
Maybe you’re thinking of the free trial of FSD that new vehicles come with?
There is a lot of criticize Tesla for, but they aren’t locking features behind subscriptions.
In the past, BMW has locked heated seats, wireless Apple CarPlay, even software updates behind their ConnectedDrive subscription.