Drinking green tea doesn't seem to produce the same hepatoxicity as seen with green tea extract taken in pill form. The problem is the high catechin concentration of the extract and the large acute dose.

https://pubmed.ncbi.nlm.nih.gov/29580974/

"Average green tea consumption was reportedly three cups per day among tea drinkers (Hakim et al., 2003; Kaegi, 1998; Khokhar and Magnusdottir, 2002), while in some countries it could be as high as ten cups per day (Muramatsu, 1991)"

"Our review supports that consumption of GTE or EGCG in bolus dose, but not green tea consumed as a beverage or part of the diet, is causally associated with hepatotoxicity"

"Evidence from animal studies demonstrated that hepatotoxicity risk rose with increasing concentrations of catechins and EGCG"

"Hepatotoxicity was clearly absent in the animal studies in which GTE or EGCG was administered in the diet or drinking water despite that concentrations of catechins in the test materials were greater than that of a traditional green tea infusion (> 68% w/w)."