The gateway is simply forwarding messages, it can provide no additional insight into the contents of the messages as to where it is being forwarded which is to the ISP provider.
The ISP provider have exactly the same information as the gateway and they are much better equipped to log and provide compliance to any laws you think that should apply.
I suggest you contact your ISP about their compliance to the logging requirements of any upcoming laws and stop trying generate additional work, fear and compliance costs onto gateway providers who are individuals operating on a much needed new frontier of innovation exploring opportunities to create new products and services which are at the end of the day what pays the taxes to keep the government in their jobs in the first place.