Yes, but only if you know what you are looking for.
So when you see “VIP” in a username or YouTube title, it’s almost always: slither.io vip by top x
A: Yes, it is distributed as a free userscript or mod APK. No payment is required. However, beware of scams that ask for money. Yes, but only if you know what you are looking for
Typical claims for "VIP" variants