And not necessarily government regulations. Maybe a contract that guarantees operation for X number of years should become the standard, or even better, an explicit agreement to open-source discontinued products so the community can continue running them.
At a bigger company, there are presumably dependencies on in-house build systems, standard libraries, etc. Maintaining open-source versions of those is unfortunately a non-trivial task.
(For other examples, the game industry is full of well known third-party "middleware" like Bink, SpeedTree, and much more because those middleware like to force their logos into places for advertising as a part of their licensing terms. If Windows had opening or closing credits it might be a surprise how many logos might be forced to show up in it.)
But in reality people (me included) will be annoyed today and forget it tomorrow, when a cool new platform is announced.