Indeed.
However, alternatives are on the horizon. For instance, Lute (Learning Using Texts):
Lute is a free, open-source PHP-Apache-MySQL project that is a complete rewrite of the core features of LWT and is basically a stripped-down version of Lingq, which is the company headed by the great polyglot Steve Kaufmann.
–Summarizer
I haven’t tried Lute and maybe it isn’t a LingQ killer. But it won’t be long for one to appear, especially one with AI built-in from the ground-up.