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I won't totally agree with your assertion here, i know that like you said, Bitvest started from this forum and have had its history and popularity tied to this forum, they have been away for quit a long time now which i believe the very many of us gamblers on this forum already know, and good thing now that they are back, they already re-relaunched their signature advertisement campaign to announce to the entire forum of their presence again.
That's okay if you don't agree, I know that the way that I think of how they approach their waking is bit odd for many and that I kind of tolerate them for being silent a long time.
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Now, no matter how popular a casino is, they still need to engage their customers in one way or the other, and one of such ways is through promotions and maybe some events which could have their customers winning some prizes, this is another good form of marketing as well, example of casino doing this is Roobet, such an activity can make a gambler who was not even ready to play on the casino to change their mind and join in the fun, most especially when they see some of their friends in it as well.
Yes you are right, that they should do something different to make their presence but right now that we're talking about them in their thread means that I am right a little bit about their fame that they don't need a bit of what you've suggested although they could've done so and given that they're already starting the campaign so I think they don't need to do a lot anymore.