quite detailed (in german) analysis here.

Sorry, but you don’t understand open source or the GPL.

i use 5 different mail addresses at once, some of them are encrypted using PGP, some are not.
I have individual signatures, sometimes several per mail account.
I can preset mails offline, don’t have to rely on five different web interfaces and can connect a central address book and calendar to all accounts.

I use thunderbird.

Original Aleppo soap. Need about 3-4 pieces of it per year, they are odorless, or at least smell only slightly earthy.
Price here 4-6 euros per piece.
I use them for the face and my (arm-length) hair.

we know what happened over there recently

hmm, at least not me. Do you have a link?

What speaks for you against uploading your content there? When users start using platforms and others realize that they work well, they will follow their example. I think that’s more effective than making a call to use a platform.

I would be interested from the users who have multiple accounts, do you use the same name and password everywhere, so do you use the accounts as “one”, or is it different for each instance?
If so, why?
For security reasons, if the database of an instance is cracked?
Do you not want your NSFW account’s postings to be associated with your other stuff?

In that case you need a suitable router, a static IP address or a DNS service, besides your own domain.

To me, the desktop hardware note sounds like you want to host the instance at home. In that case you need a suitable router, a static IP address or a DNS service, besides your own domain.

Other than that is there any obvious downside to doing that?

You must be able to administrate and pay for a server.
Apart from that, it would not be nice to participate in the network and use the computing capacity of others, but not bring any infrastructure into the network yourself (by registration lock).