You can get many open source soft cpus to run on FPGAs. The interesting bit is that RISCV is supposed to be extensible ie. it's easy to modify these cpus to provide interesting designs eg. Tagged memory to allow fast hybrid software/ hardware GCs, asynchronous cpus, rump cpus for DMA etc.
These new designs can then be used commercially- that's a big win for computing in general.
These new designs can then be used commercially- that's a big win for computing in general.