Are there any Bitcoin cloud mining scams?

Are there any potential scams lurking in the realm of Bitcoin cloud mining? It's crucial to stay vigilant, as unscrupulous actors may take advantage of the popularity and potential profitability of this method. Could you elaborate on some of the red flags to look out for, such as exaggerated returns, lack of transparency in operations, or requests for upfront payments without clear explanations of how funds will be used? Understanding these risks can help investors navigate the complex world of Bitcoin cloud mining with caution.