By Elizabeth Howcroft LONDON (Reuters) -From cartoon apes to video clips, sales of NFTs reached some $25 billion in 2021 as the speculative crypto asset exploded in popularity, data from market tracker DappRadar shows, although there were signs of growth slowing towards the end of the year. Prices of some non-fungible tokens, crypto assets representing a digital item such as an image, video, or even land in virtual worlds, rose so fast last year that speculators sometimes ‘flipped’ them for a profit within days. The art world has been quick to cash in, with auction houses selling NFTs represen…

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