63% less compared to the previous season, or is it 63% decline between the viewers of the first episode of the new season and those who stayed until the end?

Because if the 63% is by comparing two different seasons, then I think that a large proportion of that number could be explained simply by the fact that there are fewer people watching streaming series now than there used to be, because the general quality of everything available has been in a constant downward spiral, and even normies are realizing that and reacting accordingly.