Please elaborate on the recent rise of SPACs (Special-purpose acquisition company) interest by the investors (what are the advantages and disadvantages of SPACs and why so much interest during the last 18 months) please compare SPACs vs. a traditional IPO elaborate on the advantages of SPACs vs. IPOs? Why are the SPACs during the last 3 months loosing momentum...?

(Please note that a SPAC is a company with no commercial operations that is formed strictly to raise capital through an initial public offering (IPO) for the purpose of acquiring an existing company)