I don't think that such study exists.
Maybe some individuals have made it.for their own purpose or for curiosity but I don't think there is comprehensive, expert one.
However, I have the feeling that online gambling profited from lockdown because all physical casions were closed so probably even players who were not online casino fans took that possibility to continue with gambling even in quarantine.
The gambling industry continues to this day many gamblers do this because they know in the lockdown period they can also bet on what they want to study so that it will be there but still traditional gambling is still closed today and it makes the gambling industry increase because turn to online, especially now that sports betting has begun to return, of course this will be a good increase in this quarantine.
They will always be at stake because they know that now is an empty time so long by betting on gambling now.