You forget to include a word for it, invest only with those casino's that are reputable, trusted and running for years already.
It's a very important factor if you want to invest into a casino. Also look for reasonable return of your investment.
Because there might some that will indicate, guaranteed a big amount which will mislead a lot of investors.
Look always for those that has a solid support, devs and has a very good review from the community.
If a gambling site is already running for years, then they already have the funds. There's no reason for them to need more unless they got raped by a hustler and their bankroll is currently running low on funds which I really doubt.
Again, it will not have a good review until the casino has been running for a long time. How can you review something that's just starting out? A gambling casino cannot be a reputable/trusted one unless they have been running for months/years already. Then again, that means they are already funded.
Most gambling sites that's looking for investors are the new ones. Which means, it's not yet reputable and it doesn't have any reviews yet.