Can using Sticker GO lead to restrictions or bans?

Absolutely not. Sticker GO and MoGO are two separate and non-integrated platforms. Sticker GO provides a system to help users find others for sticker exchanges; it has no access to or influence on MoGO’s systems.
It is impossible to receive a ban on MoGO due to the use of Sticker GO, as the two apps are completely independent. Your MoGO account is therefore safe and unaffected by your use of Sticker GO.