Unlike traditional payment processors, such as PayPal and credit cards, most cryptocurrencies have no built-in refund or chargeback functions, although some newer cryptocurrencies have rudimentary refund features.
One investor who wasn’t deterred was Barstool Sports Inc. founder Dave Portnoy. In May, he announced to his 2.6 million followers on Twitter that he’d bought US$40,000 worth, despite saying that SafeMoon could be a Ponzi scheme, a scam in which early investors’ returns are paid with funds coming from later buyers that collapses when new deposits dry up or too many people try to cash out.

But before you look further make sure you’re aware of the risks when it comes to cryptocurrencies in general.
Interpretation of visual scalograms is subjective so it is desirable to find a more quantifiable way to validate the strengthening of coherence in bubble regimes. Fig 6 shows the wavelet coherence over time for the different period bands, in the case of the “new authors” factor for Ethereum. Coherence values, plotted on the vertical axis, vary between zero and one. Time is plotted on the horizontal axis. The areas of the price time series that are recorded as bubble-like regimes using the GSADF test are shaded red.