TL;DR - if you want to go up against the king, you should probably be better than them in some way.
I completely agree that copycat online gambling casinos are lazy and they do not spark the confidence of the person who wishes to deposit their funds on such a unprofessional website. But as far as Stake.com goes, it does have the exact opposite effect. Everyone copying them means they have built quite the decent website.
Many of the new copycats are understandable. They are new businesses with low capital so they cannot afford anything fancy, just yet.
It would be bad for them if they were victim to an exploit. Using a stable build might be better until they learn more about how to run a casino.