What happens if ETF shuts down?

Could you please explain to me in detail what would transpire if an Exchange-Traded Fund (ETF) were to cease operations? I'm particularly interested in understanding the potential impact on investors, as well as the market in general. Would investors be able to recoup their investments, or would there be significant losses? Additionally, how would such an event affect the overall cryptocurrency and financial markets? Could you provide any examples of ETF shutdowns in the past and how they were handled? Thank you for clarifying this matter for me.