Part of the trend is how casinos and bookies now opt for using internet instead of television or radio in order to advertise themselves as they used to in the past, previous the high popularity and availability of the web. That circumvents many laws, because in order to advertise one's casino on TV there are some requirements which are obviously mandatory, like being fully registered in the country. Stake and other casinos do not need permission from anyone or a single central authority in order to advertise their services on the internet, that is a huge advantage compared to traditional casinos.
That’s just how the world evolves. TV sales have already dropped because most people now use their smartphones for watching content. You can multitask, scroll, reply, and watch at the same time. Honestly, with the internet, life has become faster and everyone is busier. Online advertising fits that perfectly as it’s cheaper and more effective for advertisers compared to TV, where you pay the same fee whether your company size is big or small. That’s why more brands are shifting online.