Maybe an opt-in process would work, were the application maintainers are encouraged to move the packaging for a specific store to their repository, but only if they are willing to maintain it.
Personally for example, I already maintain flatpak recipes in some repositories, but I have little interest in looking into snap.
Some automation would be very nice, for example for updating to the latest runtime. That could be done as an automatic commit or just as a script which opens issues in repositories that use outdated runtimes.
Jonah
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