Yeah this is pretty much the case for me as well. Though for people on my friends list maybe it looks like I only play R6 Siege all the time lol. It's not the case I promise!
My main mobile gacha is Girls' Frontline, and actually I've got 100% doll completion which puts me in the top 50 leaderboard for all of EN Server as well as furniture. I whale a lot in that game.
I've been playing it since day-1 of EN launch. I would have been on JP server, but surprisingly EN came first and JP took forever to launch! GFL is known for it's really melancholy/edgy/dark storyline lol, and I do like that aspect a lot. It's also nice to have a gacha where the only gambling is for completely optional and purely cosmetic costumes. Everything essential is provided in-game and that makes it quite accessible.
Just today I restarted FGO, since I can't recover my old account, which sucks but whatever I really need all the tutorials again anyway lol. ... I think the last time I played FGO was late 2017, the latest banner included Jack and Nursery Rhyme. I maxed out both and definitely whaled a lot in that game as well. Too much in-fact which is why I initially quit. Now I've gone back to it with plans to be more modest in my spending though. Once I actually have some support units leveled I'll PM you my friend ID or whatever (honestly I forgot how all this works
) right now I'm just dead weight though so I haven't sent any friend requests.