What is similar to ICO drops?

In the world of cryptocurrency and finance, there are numerous avenues for investors to participate in and profit from emerging projects. One such mechanism that has gained significant attention in recent years is the Initial Coin Offering (ICO). However, as the industry evolves, so do the investment opportunities. Could you elaborate on what other investment models or avenues are similar to ICO drops, and how do they differ in terms of risk, reward, and accessibility to investors? Are there any key factors that investors should be aware of before considering these alternative investment opportunities?