I have been running mine for a while using the Ubuntu snap package. It is installed on an Ubuntu VM on proxmox. I also have a separate collabora online server and Only Office online server running that I point my next cloud instance to for documents. I mostly use it as a file server and it have been working great. It is more like set it and forget it. It gets backed up when I take proxmox backups.
I selfhost my Joplin server and use the clients on my Linux desktop, my windows laptop, iphone and Android. It is definitely one of my favorite selfhosted apps. To prevent any issues with sync, the first thing I do when I open the app is to click the Sync button and do the same when I close the app at the end of the day. This way I ensure that I am always working with the latest version. It has not failed me so far, considering I am a very heavy user and have quite a few notes running at any given day.
I don’t think it would happen unless all the fans of the brand start understanding the importance of opensource. But knowing Apple, they would go bankrupt before they bend to the demands of what people actually want. As long as their customers applaud or defend every dumb decision Apple has made, they will never change.
I just spent last weekend fixing all the things I broke last week…yes, the WHOLE weekend. I guess its called home"lab" for a reason :)