Odaily News The British Financial Times reported that asset management companies such as BlackRock and Grayscale took advantage of Googles marketing rule changes in promoting cryptocurrency tools and launched an online advertising blitz for their own Bitcoin ETFs. The companies have stepped up their marketing efforts and engaged in a fierce fee war. It is reported that Google allows advertising on cryptocurrency exchanges and wallets, but prohibits advertising for initial coin offerings and marketing activities that are deemed to “otherwise promote the purchase, sale, or trading of cryptocurrency or related products.”