I actually don't know if there's much that can be done unless there's some non-competes in those employees' contracts which are usually not very enforceable outside of finance iirc.
The whole point of funding a company is for the company to build IP that makes the company valuable. Founders can't take investor money and then just go start another company -- that's specifically barred in most docs. There have been a lot of these weird "loopholes" lately that are completely against the spirit of company building.
