I'm a new player from Steam. Figured I'd throw in my $0.02
I consider myself a bit of an anomaly. I joined from Steam and ended up staying, paying the subscription fee and joining a Squad so I can play on a regular basis/schedule. But I'm older 40's and I already had a decent hardware setup and have been playing flight sims since the mid 1980s.
Kids these days have a terrible sense of entitlement. I say we play into that notion...
As others have pointed out, I feel there are two problems that need to be tackled. Low number of players in the MA at any given time, and the subscription fee.
I think the solution is to allow free players into the MA, and make the subscription feel more valuable.
Allowing them into the MA will feed their entitlement needs. And they will not feel that the game is falsely advertising "free to play"
Now to set the subscription players apart from the free ones, simply limit what the free players can do.
Limit their plane,bomber,attack,vehicle set. Allow zero perk point accumulation. Limit their radio text channel access. No voice chat abilities. No ability to join a squad. No access to any special events.
Most of this should already minimize current subscribing players from taking advantage of using the free model. But you could take is further by making the limited plane set change. Make it random, or change daily, weekly, or on map rotation. Or even make it so it's a random plane set each time they crash or re-up.
Limit their options of plane customization. One set of guns, only 50-25% fuel, No or very limited Ords. Maybe even add a wait timer to re-up. Like a minute wait after crashing or being shot down. Anything other than a successful landing. You might even be able to go as far as limiting what airfield they can use, and disable country swapping.
The great thing about this game is the sheer number of planes and options... take it away from the free players, but just let them into the MA. The two week trial is just not enough for the entitlement generation.
And heaven forbid, if the player count in the MA gets too high with all the free players, make the free players wait in a queue, and give the subscribers priority access to the arenas.
Let them keep the ability to create and join private, custom arenas with full access. This will let them play with what they are missing from their free version of the MA.
I feel allowing the free players into the MA will boost the numbers enough to make more of them consider subscribing. The biggest complaint in the Steam reviews is the lack of number in the game to warrant paying... Then once they get a better taste for the game they will have a much better incentive to subscribe for all the planes, perks, radio, voice chat, squads, and special events. At worst it will add more targets to the MA and make it easier to find a fight. Finding a fight was another common complain from the Steam players. Even if they don't subscribe we all like more targets to shoot at right? And nothing changes for the current subscribers. We don't like change anyway.
Anyway that's my $0.02.