I was having the same question! Without house edge, I can't think of other ways of generating incomes. In this way, it won't be beneficial in the long run...
Works fine from my side. I guess you might be on their restricted country list. I checked their terms of use and there wasn't much to read actually. I couldn't find the list of specific restricted regions.
Just think of the same business concept but with house edge, still, sustaining this business is quite a challenge. How much more of a gambling business without a house edge? So yes, this type of gambling endeavor would be hard to sustain as you need to find a way how to keep the interest of your lottery bettors.