Do you know where the line is between what e.g. Citron Research is doing and what is considered slander? (I assume they walk a very thin line in order to not get sued)

Their Shopify video [1] for example is not the typical „research report“ with lots of specifics but more of a personal opinion with rather broad accusations.

[1] http://citronresearch.com/citron-exposes-the-dark-side-of-sh...