Some background - on Dec 21, a Youtuber and chess fan named Agadmator sponsored a tournament on lichess; anyone could enter, it was 2 hours long with 2 minutes per player per game and some other rules related to arena tournaments as usual; for those not familiar with arena tourneys, part of it is just getting in as many games as fast as possible. The hook is the prizes:

1st PRIZE - 1 BTC
2nd PRIZE - 2500 DFI (about $10k)
3rd PRIZE - 500 DFI (about $2.5k)

So the tournament starts and as you can expect, there's massive participation, including many of the world's top GMs. About an hour in, pairings suddenly stop happening for many players and the site sort of just crashes. However, this crash isn't universal and some players are able to keep playing and racking up points before they acknowledge the thing has become impossibly compromised, so they pause it.

Today they announced the tournament would restart on Jan 11, taking into account some of the previously played games, and restricting who is able to enter. Definitely some controversy as the determined cutoff for previous games to count has unclear justification. It's really uncertain why they didn't just cancel the previous tourney and start over again.