Luckily, being those apps open source, a new fork has been created.
It's called Fossify. They forked all the apps on GitHub and they have a new maintainer.
Now we just need to wait for their first official release and then... we need to spread the word and make people switch from the old SMT apps to Fossify!
Correct. Meaning it can't be turned proprietary because if they distribute copies, they must distribute the source code to everyone who gets them, under the GPL.
I don't think the new owners can just pull it from F-Droid, I hope the F-Droid team has a code backup. I think they will migrate everything to fossify. With the gallery this already happened, the SMT Gallery vanished from my phone and the fossify gallery appeared. I guess that's a good way to go, since for now fossify is just the same thing with a different name.