I find it sustainable. I host my own instances. I can moderate as I seem fit.
Private forums have worked before. We have to relearn how not to have a corporate overlord without soul who moderates only based on law and advertiser friendliness.
But we also have to learn that we are not always welcome on other peoples instances and that's okay. People host these instances and they have opinions. Since it's the fediverse we can try to find a place where we fit in and there is a good chance we still get to talk to everyone else. Mastodon for example has a good way to move to another instance so it's okay to start on a big instance. I'm sure lemmy will get that too some day.
Let me rephrase that: I never heard one. There is a word for tip of the tongue but not for the concrete situation OP described. I mean the possibility to just look up stuff wherever you are is a very recent development so it makes sense that a word that incorporates this isn't invented yet.
The ActivityPub protocol works by sending out every action on one server to any subscribed server. The subscribed servers save this data and make it available to the local users. If it worked the way you described, every server on the fediverse would store all the data from the whole fediverse. That seems wasteful.
With FEP-c118 there is currently an extension to the activitypub protocol in the works to allow setting a license on posts. If you don't add a license info in your posts the licensing is unclear. I think that some jurisdictions give a default copyright and some protections to the author but I don't know how that works.
With the fediverse you you have as much or as little rights as when you put it on your private blog without explicit licensing. If someone uses your works without your consent you still have to find out and you have to protected your rights yourself.
There are currently no lemmy or kbin instances that have monetization options. The only ActivityPub software I know that can show ads is misskey.
In the end you have to be aware that any kind of open social network is like screaming your thoughts towards a big crowd. You lose most of your control over it the second it's out. It is nearly impossible to track who has the information and who shares it with others.
There are legal protections in some parts of the world but even then you first have to find out that something bad happened. If an instance were to start monetizing data it would probably cut off pretty fast and all the communities would probably move.
Still if there is stuff you don't want everyone to know don't post it publicly.
There is a common misconception that long term effects will manifest long after the injection. All vaccines with longterm effects manifested their effect shortly after the injection. It makes little sense that you will have adverse reactions months or years later because the compounds are long gone from your system.
There was also the misconception that the vaccine was rushed and that steps were skipped or shortened during testing. That is not the case. The administrative processes were prioritized and there was a huge amount of test candidates so testing could be done much quicker. The normal process is not longer because they want to gather more long term data but because it just takes longer to gather it.
If you have budget constraints why not go for a used computer. I recently picked up a really nice used Dell XPS 15 for under 400€. Going cutting edge with budget constraints is rarely a good idea. Good hardware from a few years ago might outperform current budget hardware. What you should look into though is of it has recent bios support (I know Dell XPS are very good in that regard).
HA might be possible in a active passive configuration if you don't have any dependencies on external hardware like a zigbee stick. Active active would need support by HA and I don't think that is implemented.
I think the most secure thing is to keep regular backups so you can roll back easily.
But I want something else.