It's quite simple: it enables true micropayments on the Bitcoin blockchain by making access to mining ubiquitous.
It's amazing how people with 1 year activity on this forum don't have a clue about bitcoin
How the hell is that piece of garbage enabling micropayments?

Why so butthurt?
Tell me genius, how do you send a 2 satoshi transaction on chain right now?
Tell me genius , how will you send a 2 satoshi transaction with that device?
Is that device not following the bitcoin protocol rules?
That device is a miner tied to a non negligible mining pool.
Using some payment channel magic and their microtransactions server your 2 satoshi transaction will be aggregated with a bunch of others and settled into the blockchain as they mine blocks.
4% is negligible.
magic....? like lambchop's unicorns?
and their microtransacations servers that is like lambchop's ... hmmm tough one... brain? aka totally missing?
At the very reasonabe retail price of $400 this device is a steal and everybody here knows it.