Favouring its own comparison shopping service

‘[T]he General Court finds that, by favouring its own comparison shopping service on its general results pages through more favourable display and positioning, while relegating the results from competing comparison services in those pages by means of ranking algorithms, Google departed from competition on the merits.’ Press Release No 197/21, General Court of the European Union (10 November 2021) What is the basis for the European Commission’s decision (largely confirmed by the General Court) that Google abused its dominance by favouring its own comparison shopping service over competing services? Is the decision consistent with previous case law on Article 102 TFEU?