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.
Most lottery-related businesses here don't survive in the long run. So they need to take a look at their cases and see how they can change the end game of this business. Enticing lottery bettors alone is a hard task. So sustaining these bettors is actually a serious challenge for every lottery business owner.