Disclaimer: I am a Nubank employee, so there might be bias.
Regarding the future of Clojure, I believe that not much will change actually. Before Clojure was sponsored by Cognitect and had Rich's / Stu's and Alex's stewardship and that's gonna continue to be the case just swapping the sponsoring company behind it. IMHO it's only on Nubank's best interest to have a strong community around Clojure and Datomic as well.
About Platformatec I think that was a very different thing, it was more an acqui-hiring, and before Elxir's stewardship was under the company (but having very different development dynamics compared to Clojure) and after the agreement, it was transferred to the community. So the company was pretty much dissolved after the contract, and back then, that was clear and transparent, as it was announced to happen.
Regarding the future of Clojure, I believe that not much will change actually. Before Clojure was sponsored by Cognitect and had Rich's / Stu's and Alex's stewardship and that's gonna continue to be the case just swapping the sponsoring company behind it. IMHO it's only on Nubank's best interest to have a strong community around Clojure and Datomic as well.
About Platformatec I think that was a very different thing, it was more an acqui-hiring, and before Elxir's stewardship was under the company (but having very different development dynamics compared to Clojure) and after the agreement, it was transferred to the community. So the company was pretty much dissolved after the contract, and back then, that was clear and transparent, as it was announced to happen.