Coming from a blockchain background, (I worked for a games company on the blockchain, and was an invesor) I am very happy to see to company using the blockchain it in the correct way. KUDOS.
Usually you get companies adding 'blockchain' to their name as a sales technique, to drum up interest and sales....- the rule of thumb is 'if the sale pitch can have the word 'BLOCKCHAIN' replaced with 'DATABASE' then just ignore it - many failed ICOS have gone tha way....- BUT data protecion....., where no-one can touch the original source (as its on the blockchain) is a fantasic use case scenario. Great idea. I did feel their use of EOS was cheeky, but wise, as the coin is free to use for the user.., and infact earns them money for the usage of the coin with each transaction (business savy)- whereas, a more mainstream coin,ie ETH (known for is smart conracts and speed), is not included in this deal, but is accepted on a paid plan.
The UX was only slightly bad (mainly good), as I did not see an obvious notification stating I should download the app on wordpress, - I only guessed from expereince it was required. Perhaps I missed the prompt. But insallation was simple, and now I have my content time stamped. Whoop.

PROS: Easy install, great useage of blockchain.

CONS: limited coin selection on free plan (XLM would have been a better use case imho). Not obvious about wordpress plugin.

Verdict: Fantastic to see these new uses of crypto coming out.

(Disclaimer: I received a free test copy of the product, to give an hoxnest opinion)