https://www.reddit.com/r/TheSilphRoad/comments/86d5d1/team_bonuses_need_to_be_removed_from_raids/
Minority teams are at a serious disadvantage in many areas. Less team contribution balls (in some areas, even 0 is common), less gym control balls (if the dominating team takes all the T5 gyms).
As for my area, it doesn't matter if a T5 gym is yellow. Few people care about gym control, and I'm one of the few who care, regularly seek out yellow gyms T5, and have been called crazy for walking 500m to a yellow gym T5, when there was a blue gym T5 just 100m away. I often barely get 1 team damage ball as a yellow player even at a yellow gym. Adds up to 10 balls on average (6 base, 1 PD, 1 TD, 2 GC). The highest I've got is 12 balls (1 PD, 3 TD, 2 GC). I believe this is true for majority team players too, just that they get this number of balls way more often.
For non-yellow gyms, if I'm lucky to get a yellow-heavy lobby, it's usually 9-10 balls. I've even gotten 12 at a blue gym for a Raikou raid once, before the rejoin bug was fixed. I used mainly Rhydons, so I didn't have to rejoin.
I fight a lot for gym control. I'm one of the last yellow players in my area who actively participate in gyms, and probably the last one who still fights for T5 gym control, and I regularly run into potion shortage (if they feed, I go on for a few GRB rounds before stopping), even with 2 yellow accounts (see below).
If I need pokecoins for whatever reason, I go to a "team-balanced" area nearby, there are 7 gyms there (a few in an Exraid-less park), and the gym scene there involves all 3 teams actively battling each other. My gyms there typically survive for 6 hours if I go there in the afternoon, as red will come in the evening to clear every non-red gym.
As I've said before, in order to survive in a heavily outnumbered team, and against blue multi-accounters, I had to create a yellow alt account (mainly to fill gyms to deter immediate attacks from blue players, bypass GRB feeding cap and avoid healing item shortage). In the past when shaving was rampant here, I placed a Vaporeon/Ttar on the alt account first, then switched to place the Blissey on my main account, so the Vaporeon/Ttar will get shaved first.
Playing in a minority team here has not been easy, but I still enjoy the challenge of it.