Why Spectre has a "weak" liveness?

Why Spectre has a "weak" liveness?

According to this article: (https://medium.com/@avivzohar/the-spectre-protocol-7dbbebb707b5) written by one of Spectre's author (Aviv Zohar), it is mentioned that Spectre has weak liveness.

What is the reason of mentioning "weak" for liveness ?

And according to this, can we define a "strong liveness" ?

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