It’s not a matter of opinions. It’s a matter of policies and behavior. According to your thinking, you mean that Lifetime members that bought a Lifetime 2 years ago shouldn’t have any AI because there wasn’t any before, right? Or 3 years ago? Fortunately, you are not the one making those decisions. It’s not an obligation for a company to have Lifetime subscriptions.
These were the policies before, if they changed things should be for the new ones, and things should be clear! And by the way, it’s also a legal matter!
You might notice “Unlimited Access”. You gain unlimited access to ALL FEATURES.
If, as a company, you want to change things, you shouldn’t change them for the previous ones. I don’t think the vast majority of users are lifetime users anyway. It shouldn’t be a big deal. As I said before, if it’s really a problem of resources and costs for some lifetime member that abuse the system, we could talk about it, but I don’t think that’s the case. Imho.
You might notice in this answer from Zoran a few years ago.
“…you won’t have any limitations in that language for as long as you are LingQ member”.
I stand by my way of seeing things. But it is what it is!