Experts from Grayscale, Tether and the Chamber of Digital Commerce reached a unanimous conclusion at Benzinga’s virtual Crypto & Blockchain Outlook webinar Thursday: the spot Bitcoin ETF approval has taken the cryptocurrency space from “not relevant to relevant.” But does this mean cryptocurrency is — finally — going mainstream? ETFs A ‘Big Victory For America’: Brock Pierce, co-founder of Tether (CRYPTO: USDT), sees a “more resilient Bitcoin” after the decision. The approval is great for American businesses and a “big thing” for investors to safely access the market, he said. Pierce also said…