Being upfront, my experience of the people in charge of the organization there doesn't have much goodwill left. Nothing against Thibault personally, I think he's done some great things but seems to be busy with whatever he's interested in and management isn't it, and he has some unprofessional people with access that work for the project/charity.
I had volunteered my services years ago as a System Administrator (no charge) with suggestions, but with limited modes of communication, multiple issues going stale, no response with an auto issue closed. They have issues that don't get addressed, and their process doesn't appare to be aimed to cultivate qualified volunteers or improve the bus factor of the project.
To make things worse, when I expressed disagreement with constructive feedback regarding one of their process decisions, one of the other dev's with access apparently took offense and the next day I found my lichess account had been edited by an admin without notice or notification. I could not log in (wrong password), the password and email for password recovery were changed, and trying to access the profile URI directly showed the account as banned.
It seemed this was done out of spite, and definitely without any kind of due process. Appeals by email went unanswered within the 90 day cutoff I gave them. As a result I submitted a complaint to the french charities regulatory body and moved on since the group wasn't worth wasting any more of my time. I haven't heard back so who knows if anything came of what I reported.
In my opinion, they've got more internal problems than they let on, and to me this is just spillover.
Its unfortunate because any failure like this impacts so many people, but I don't find it surprising given my limited experience of the people there.