There are some other questions that I have too:
1. Can I use VPN? I can't find answer about that in FAQ page.
2. Let's say I purchased 2500 fun token on hold them on my freebitco account. These fun tokens should give me 4 free spin of Wheel of Fortune. If I don't visit my account for 30 days, will the number of my free spins sum and become 120? Or will the unused WoF spins become nulled after a certain timeframe?

There is no rule about using VPN as many people use them for privacy reasons. The only things that are forbidden are using more than 1 account or using bots/automation.