But I found this, is connecting to social media a way to get some rewards? I think it would be very unwelcome to just link it because it automatically has permission to access social media if someone just wants to get rewarded.
It's not mandatory to connect your social media accounts. If you don't like your social media accounts to get connected, why bother to claim the reward? I would simply ignore and move on if some such free claims require for my social media account to be connected.
What is the house edge as I couldn't find that on the site, we already have existing casinos that offer a high percentage of even more than 5% which are already reputable with 100 active players on the site.
5% house edge? Which casino? Do people even visit that site? Do you know what you are talking about? Learn more about house edge here-
https://knowyourodds.net.au/house-edge/The lower is it, better for the players.