I agree relying on proprietary platforms which may shutdown is a good thing. I'd go so far as to say all platforms inevitably WILL shutdown.
But GitHub issues can be exported pretty easily. Exported and saved in the distributed Git repository even.
I think relying on a platform is perfectly fine if you have an exit strategy. I've moved my blog through multiple platforms. I even maintain the domain so old URLs continue to work. Will Medium shut down? Yes. And when it does I'll move my blog again. It won't be the first time and it won't be the last.
But GitHub issues can be exported pretty easily. Exported and saved in the distributed Git repository even.
I think relying on a platform is perfectly fine if you have an exit strategy. I've moved my blog through multiple platforms. I even maintain the domain so old URLs continue to work. Will Medium shut down? Yes. And when it does I'll move my blog again. It won't be the first time and it won't be the last.