I can't say for all, but some people see some weird things in statement that someone can promote gambling (where 95 % will lost their money with probability of 100 % ) and they forbidden to promote the same things, just with a different title.
Gambling sites don't claim to be 100% safe:
Can anyone shed some light on this "InvestBox"? This is all the information I can find on their website:
Invest your free coins to InvestBox! Its a tool for devs to promote their coins. Its NOT Pyramid/HYIP, all payments are made from special fund.
InvestBoxes can change status from Active to «No coins», but you can close your investment any time, its 100% safe.