No. Regulated online poker in Pennsylvania is ring-fenced, meaning players can only compete against other players within the state. The Multi-State Internet Gaming Agreement (MSIGA) is in place, allowing operators in its member states to share their player pools across state lines.
As of now, the interstate shared liquidity agreement is signed by four states — Nevada, Delaware, New Jersey, and Michigan. Pennsylvania is expected to join the agreement with other states.
However, for GGPoker to share its player pool, it must be operating in at least two states that are part of MSIGA. There is no indication that the operator has sought approval in other states as yet.