First, the team is gone.

It's a shame. I often encourage people to understand that deleting things in our digital world leads to a loss, especially a loss of information and sometimes of capacities and it's worse when it's not reversible. That's something an average computer user usually doesn't appreciate. Lichess introduced teams in 2013. I don't know when the community team was created yet, but the use of #steemchess dates from October 2017. You could have possessed one of oldest Lichess teams that hosted chess events in connection with the blockchain, but now that is gone. Luckily we have references and records from our posts, but the capacity and the "badge", to put it that way, are gone. So, we can argue that we're basically "starting over" on Lichess.

But I have no intention to run after everyone separately and give them lots of messages to find out that they are not active anymore.

Of course, you don't need to do that. It's actually inevitable to have inactive users all over the place. I can help you to find out the inactive Hive accounts and inactive Lichess accounts very easily. I'm not sure I understand what this has to do with deleting the team and creating a brand new one :S