1. It depends on the coin and platform choosen for staking, when its stable coin the APY is fixed and fir some reputed coins as well.

2. Staking isn't giving huge returns but staking bitcoin or Tether with APY over 8% is somewhat profitable.

3. My ad blocker is blocking the link so I don't try to visit the link but logically investing 200 and return oer month is 3000 doesn't look real, so probably its a scam.