ソース:[1] DraftKingsがCFTC規制下の取引所Railbirdを買収し、予測市場へ進出 (https://www.techflowpost.com/newsletter/detai ...)[2] DraftKings、Railbird取引所買収交渉で予測市場に戦略的参入 - InsideBitcoins.com (https://vertexaisearch.cloud.google.com/groun ...)[3] DraftKings、Railbirdを買収し予測市場に拡大 | PYMNTS.com (https://vertexaisearch.cloud.google.com/groun ...)