Using a VPN to bypass regional restrictions in bf6 is a violation of the tos i believe. They also went out of their way to block a lot of major vpn providers for that very reason.
High ping is an advantage, in fps games often due to bad netcode that doesn't take into account high ping players in its lag compensation features.
Ive paired with a friend from Europe and played their servers with 100+ latency and I was able to play alot more aggressively and I was shot through cover a lot less often. My bullets also registered more often meaning the netcode favors high ping, assuming you are a good player who is used to those conditions.
I also have been reporting these players for cheating, because they ruin the hit reg and gameplay for the majority of players in the server who have the regional right to play in their own servers that the game intended. If they are paired with a friend or using a VPN the reviewer of the report system should be able to make that call themselves.