Despite any changes in Sourceforge's ownership/management, I have not experienced any problems retrieving source code. I have not tried to use a graphical browser on Sourceforge since the 1990's. No need.
As an end user of source code, I access Github the same way, without graphics. I do not need to use a web browser or any git executable to fetch a .zip or .tar.gz archive. Will this sort of easy access continue under the new management? I guess time will tell.
Sourceforge still hosts a substantial quantity of what I consider educational/useful software. Of course, Github hosts exponentially more.
Out of curiousity, using archived Github data, I am making a list of Github users and will be monitoring changes as the acquisition progresses. Will they lose many users? Where will the users who leave put their code?
I am debating whether to also construct CSV files with repo names and descriptions for a personal Github database to aid in software discovery. I expect it might not be as easy to compile such a database in the future. I could be wrong, but it is impossible to predict what will happen. Time will tell.