Recently, The Hollywood Reporter did a poll regarding HBO MAX.
According to the 500+ page report, 9% of all adults and 18% of adults age 18-34 are much more likely
to subscribe to HBO MAX because of the new Looney Tunes shorts.
For comparison, under "Much More Likely to Subscribe"
DC films: 9% all adults, 16% Age 18-34
The show Friends: 8% all adults, 15% Age 18-34
Game of Thrones: 10% all adults, 16% Age 18-34
Harry Potter: 14% all adults, 19% Age 18-34
The survey also goes into detail on who the respondents are, by age group, generation, religion, political views, subscribers of other services, etc.
To add, 49% of Generation Z are likely (total "much more" and "somewhat more") to subscribe because of Looney Tunes, as well as 24% of Generation Z, and 34% Millennials.