Absolutely not.
They are built with chips scrapped from old S9 boards or other former ASICS. So firstly it depends on the Bitaxe vendor, bought 2 from d-central tech, they died within 2 months of usage.
I complained, and they block me on Twitter. Secondly low diff pools are really badly managed (daily reboots and constant crashes).
If you are running your own BTC node, and running your own hosted version of let’s say public pool, it s a different story though.
All in all futurebit is shipping better alternatives or you can build yourself a bitaxe since everything is open source.
Best way to make money with those is to actually sell them.
You are not decentralizing anything, because two years after those bitaxe were deployed I think that only one block was found so far but several thousand (I let you do the math).