I would like to know if the site will later interact with its customers? Where is an open chat and allows communication with the organizers and in turn with the participants? This with the intention of knowing their growth, many times it is necessary for many players to see how many participants there are and how many enter each day. Also if they can implement some type of StreamLives to attract more people by offering some prizes, this helps to give the site a lot of reputation and credibility.
You can join the telegram, at there the team always interact with their own customer example Macallan a.k.a denis he one of the players at loteo who really loved playing at loteo and he was really active chating/sharing his betting activity on the group with other community or the team. Also the team sometimes doing an AMA for the community, answering a question from all people who watching an AMA.
To see how many participants, i think you can count by yourself with the ticket prize or maybe you want to check at the explorer ethereum to see how many tickets for each person. Everything on loteo can be tracked at ethereum explorer, sometimes before i join the lottery i checking by my self at there.