A tech selloff accelerated on Tuesday, driving down futures as the high cost of the artificial-intelligence buildout weighs on investors. The tech-heavy Nasdaq100 fell more than 2% on Tuesday. In premarket trading, Alphabet, Nvidia and Oracle were considerably lower, the Wall Street Journal reported. The boom in AI is souring as concerns about heavy spending [...] The post Tech selloff sends stock futures tumbling as concerns over AI buildout costs mount appeared first on CBNC .