RethinkDB kicked (at least) 2 people from their Github organization involved in Horizon development. This tells me they plan to continue the organization in some way--probably under another company and not with Horizon at all.

Considering who these 2 people were and their contributions, it wouldn't make any sense for them to hurriedly remove them. (One was also a RethinkDB developer). That is, if the "continuity plan" were just gifting it to the community.

It's all speculation but I think it paints a clear picture. I have been doing a pulse check on RethinkDB / Horizon for a while so I've been watching this pretty closely.