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Alternative to Google Photos
(self.foss)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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If that's the case you'll probably be well served with that model you linked above.
As for what your options are, there's a ton of functionality you can add to them through apps and can even practically run whole VMs on them. Probably not a great idea with the above model but the option is there.
Technically you could set it up as a pihole as well, yes, you'd need to install the docker service and load a DNS service and pihole into it, you can probably find some guides online how to do so.