Can sawtooth be used as a permissionless blockchain?

I know large number of public blockchains are around but i realy love the flexibility that hyperledger sawtooth provides so is it a good idea to use sawtooth as a public permissionless blockchain? I can't use Ethereum because it is not feasible for microtransactions and is not scalable. I can't use IOTA as it does not have smart contracts enabled with it.

#blockchain #bitcoin #cryptocurrency #altcoins