This is all relative again, though.
I won’t venture to talk about sportsbetting or poker players, but casino players can easily drop this regularly for years.
They will move between different softwares and casinos though.
Now if you have a “click and out” site that caters to the “as many clicks as fast as possible” philosophy, likely the one casino is the only one this player brings you money from.
If you have a “bookmark this” type site, The player may be playing 5 casinos and all of them under you.