I had a few dollars of Bitcoin on Eobot and they allocated me some Bitcoin Cash that is appreciating nicely. It's not enough to be worth cashing out. I also have a Bitcoin Core wallet locally, but there's very little in that. I guess I should have some Cash related to that too. There's a comment on Luke's post that suggests how I could do that. I'll try it some time.
The problem with having small amounts of BTC anywhere is that the fees seem to make it non-viable to extract.