I don't think SIPP provision goes against the IB business model. They already offer IRA accounts in the US, which are basically the same thing. The question is more likely to be can they make it pay, and/or find a suitable trustee/administrator.
CFDs I believe do not fit into the IB model. Their whole thing is about getting access to exchanges, not OTC. That might not stop them though ...
CFDs I believe do not fit into the IB model. Their whole thing is about getting access to exchanges, not OTC. That might not stop them though ...