Hi thank you for checking out us.
The medium logo might be a typo, I have forwarded the issue to the dev, should be resolved asap.
Yes, you need to hold at least 500 ARTS to get the premium NFT, which earns you a reward. But if you don't like to hold much, you have other options like providing liquidity or creating NFT, trading on Artivas platform.

*Anyone who holds the premium NFT, earns a reward regardless of their holding of ARTS. So the critical thing is getting the NFT, which you get only by holding ARTS.