This was posted on their website a few days ago, the direct link appears to be broken but the post is visible on their homepage: https://www.ugcleague.com/
Even if they have been pretty much dead the past few years and were irrelevant for EU and NA 6s, I thought it was worth mentioning here as UGC was still a pretty big part of (HL) TF2 comp history and they also hosted some other formats afaik. They are stating they will remake the website so player and team history isn't lost, with the mention that they might host competitions in the future, but not any time soon.
edit: see GeneralNick's post further below about the actual state of things