People tend to prefer the old casinos because they are
Tested
Relaible
Strong
Have scope of upgradation
Trust
Especially those having continuous promotion like Bitvest and 777Coin people herein this forum are fully aware of old online gambling casinos even if they are not gambling, because they always see their banner and logo on members's signature everywhere they posts, other gambling casinos should follow's Bitvest and other old casinos with promotion.
These 2 sites have been here for years doing their promotion through signature campaigns. Also, 777coin does a daily give away of 0.00001000 BTC in the games and rounds section, if posted in a following format. But we have many other gambling sites now due to people coming on the online platform in this work from home time. Some of them would have captured a certain % of market as well.