There are many problem of EOS based. So, our dev team decide it for Ethereum based.
This is understandable, because the majority of icos are on Ethereum. But it was an unexpected change and I hope that's justified.
Oh i see! So it now clear that they change their partnership from EOS to ethereum which I think is a good option especially that the team already been seen several problems using EOS based. Also, It is really good for tombola to use ethereum which almost all the ICO are using.