I would say they did pass a universal law.
Big companies that can act as gatekeepers to doing business in the digital age are very different from small companies. If any company grows into gatekeeper size I think they too will be subject to regulation. Future companies around AI could also grow to a size where they gatekeeper access to AI tools and they would likely end up regulated too.
Yup, there's a big difference. Same reason that iMessage wound up not being regulated under this law; it didn't have the power unduly control the market. The law is sensible. It doesn't even capture all of Apple and Google, only those certain parts of interest.