Honestly I would chalk this up to Coronavirus (possible mandatory quarantine), being able to easily buy online, supporting your local brewery, and popularity.
Yes. Tree House is limiting the amount they sell each day, self imposed. They are trying to limit the amount of human interaction at their brewery and with others due to the corona virus.
TH is releasing a certain allotment each day. You have to go online at 9:30 to order it and then pick it up later that day at the brewery before 6:00. You stay on your car and they bring it out to you, put it in your car. so there is no contact. Once they reach the allotment via online sales the website (treehouseonthefly) closes for the day. I don’t know ho quick they sold out today, but yesterday it was 10 minutes. Suarez is doing the same but doesn’t sell out like that. Trillium is doing something similar, and also sending out kegs to distributors for growler fills. I am impressed with the way folks are adapting, Hell ya.