There has never and will never be any pay to win. Everyone has access to all weapons at any time, no unlocking, just pure skill.
Up to 4 players on your team (ship) open servers with other players all sailing around all the time. You can get in an organic fight over treasure, or matchmake for ranked battles.
All of the progression is cosmetic based.
The devs have been adding content constantly since launch that fleshes out the game systems and makes for more interesting interaction.
I come back to this game all the time. Highly recommend.
This game is so much fun, even when I’m the loner getting my ass handed to me on my sloop (which is most of the time). Seeing a ship looming in the distance and wondering if it’s going to come after you is such a rush.