People nowadays bet more online than in physical objects - casinos, they are given the opportunity to bet in the comfort of their homes, without having to leave their homes and without the cost of transportation and accommodation.
or because it started with the increasingly difficult global COVID-19 situation, and more and more countries are advising or even banning their citizens from leaving their homes, and people are spending more and more time at home with their phones and internet now. And this is also the reason why the online gaming business is booming, because people have nowhere to go.
and whether the success of online gambling may affect casino or physical gambling.
Online gambling is a success because nowadays everything that's "online" has bigger success that everything offline.
We live in the digital age and the people are more dependent by their computers and smartphones than ever before.
The COVID lockdown era is over for most of the world( except China and maybe a few Asian countries). I don't know why do you think that the lockdowns are a thing anymore. Their influence over all online industries was temporary. The long term influence is caused by the digital age we live in. Most people would always choose the convenient option, rather than the not-so-convenient alternative. That's how the human brain works.
The offline gambling industry will survive for sure, but it will be concentrated in several major "gambling capitals" like Las Vegas, Atlanta, Macao, etc.