I met my current GF in-game.
We had been in the same FC, but at the beginning we were just normal friend's like we were with all the other people from the FC. Even had some IRL FC meeting during some convention's. We where not attracted to each other, simply because she was in a relationship at that time and I was looking offline for a partner.

Then the FC felt apart due to some drama and most of the people moved to other server.

I kept a bit in contact with that one girl because we both stayed on our server and had house's next to each other.
But we haven't done more then the occasional roulette together and some simple small talk.
We both became single within the timeframe of 0,5-1 year where we sometimes played together.
And at one point it went from playing once/twice a week to daily rouletts.
Being in VC together for hour's.
Confession of feelings towards eachother.
Planning a day and place for a IRL meet-up (we live 1-2 hour's drive apart)
We meet, liked eachother IRL.
Have been together for 2 year's now and move into the same place next year.

So yea, that is probably something that could have happen in any offline friend group, too.