If we go down the regulation of alignment route, we'll have to ask experts to create those regulations and monitoring regimes. And which experts will the government ask? Oh, right, the parties that stand to benefit the most from regulation: OpenAI and Anthropic!
When "the experts" make certification cost $100M/model because "safety and alignment", then they will have cemented their duopoly.
Meanwhile, tariff rates on compute is a simple percentage that can be scaled up and down. Congress doesn't need experts to do that. Vendors can participate proportionally to their scale. This is far simpler and far more fair.