Unfortunately, the first time I bought altcoins (J8T) under JET8 Foundation, I immediately lost all my money as the value of the tokens went from $0.10 on launch day, to $0.00001 within the span of a week.
Believe they cash out the capital and just forgot about the whole tokenomics and/or token buy-backs, an injecting funds back into the tokens.
Some other projects burn some remaining coins as well and set a safe 10% buffer in the back-end, just to control the pricing.
Unless projects are IEO or security-backed, I would say be very careful with all the ICO/ITO that are coming up - the industry is still mired with scammers unfortunately.