This gives sellers an incentive to charge transaction fees, since they get paid faster by doing so, and so it’s fairly common for cryptocurrency transactions to come with fees.
As noted elsewhere by a prominent author in the area [25], there is not a widely accepted or consistent definition of the term “bubble”. The GDASF test used here assumes a bubble is any time series interval which deviates from a random walk to become explosive.

For 21 years, the software company Kaseya labored in relative obscurity — at least until cybercriminals exploited it in early July for a massive ransomware attack that snarled businesses around the world and escalated U.S.-Russia diplomatic tensions.
But of course you'll want to be wary of another possible Squid Game fiasco, which reportedly scammed users of an estimated $3.38million.