I mean I do agree that website doesn't "look" like a website that is a multi-million dollar company website, and it is basically give or take the same design as what it was 10 years ago, with only a few minor changes, I do agree that it needs an overhaul of design changes.
Yes, it's a little strange that they give away so much money in rewards and jackpots but you can't feel that on their website. Their website needs a serious update but probably it's part of their strategy to leave freebitco as it is and as it was years ago to attract nostalgic users. Also, as far as I know, they have other projects (dplay.casino as I am aware) where they build new and innovative gambling platform.
I mean if it is not broken why fix it right?

This website may look not so great, and I agree that it definitely needs a graphics overhaul, their UI is from another century, it looks like it was made with first html/css combo in the 90's, however at the same time it is one of the biggest crypto websites ever.
You are right that they have other websites and those websites are probably doing fine, and they have fun token as well which is not only here and is working in other places as well so it must be bringing in some cash however, I think nothing makes as much money as this one does, hence I am not entirely sure if that's the case. I think it's quite important to realize that you could just chalk it up to the fact that everyone still loves and uses it this way so they never felt need to change it.