Amazon.com Inc. has been hit with a £2.7 billion ($3.4 billion) class action case in the U.K. over allegations that it abused its market dominance, putting third-party sellers at a disadvantage, Digit.Fyi reported. The claimants said the firm favors its own products and logistics services and has unfairly placed a condition of Prime membership on the use of Amazon’s own logistics services over competitors.