This is why regulation is needed. States do not allow any kind of car on the streets. But often car manufacturers say it will threaten economy and labor.
This is not at all what a softcore is to me.
This simply means that it is not a cpu which takes physical space on the FPGA whether you use it or not, it would only takes some celle of the logical array if inferred.
But it is rather redundant to say vhdl and softcore, plus there are no riscv hardcore yet on FPGA.