Technically speaking, you're not really buying anything:
At this stage, customers will only be able to buy and sell interests in cryptocurrency and will not be able to transfer their cryptocurrency holding to other Skrill customers or use it to transact with merchants. This service will be added in the future.
So unless the ability of withdrawing your funds is added, we shouldn't be that excited.
It should be added in the futur ... it's the first step for that.
Regarding the number of users and merchants around it, it will be only benifical for Bitcoin !
In 2011 only, the company's customer base reached 25 million, including 120,000 merchant accounts, what about 2018 !
Source:
https://en.wikipedia.org/wiki/Skrill