There are ways to block most data collection, as I said an example of this is using a browser with built in blockers for tracking and/or extensions.
The other part is on the user hands, proprietary services and apps are always going to track something even if minimal, like I said using Chrome or Google search or visiting reddit or opening an embedded image preview from imgur are totally on the user, and could be avoided.
Not an expert in this and someone can correct me or expand...
In the case of imgur or reddit, with embedded content like image previews or when following a link the destination site can know where you came from. Here a link that explains it better than I could.
In the case of Google, if you use chrome or search lemmy.world through Google and then click it from the search results, google knows
And if you don't have any tracking protection via browser or extensions, there can be tracking using cookies for example.
Cloudflare is probably a false flag detected by this site
And in my particular case following your link it told me "No tracking detected on this site at present." As seen in this image
Loneliness
Old laptop, Debian with docker running nextcloud, navidrome, jellyfin, gitea, librespeed, wireguard, dnsmasq, and nginx as a reverse proxy.
QR is just image to text, most QR reading apps I have used, show you the QR content before going to the website (or let you disable opening the link directly) so you should be able to check the URL or content and see if the link is legit or not.
But let's be honest most people don't know or don't even bother and that's the real problem.
I recommend DuckDNS as well, you can run it both sides and set up a daemon to update the domain when there is an IP change automatically.
And with Wireguard you can set up a tunnel between both locations so you can share anything you need.
I'm using Debian, with Docker and running Jellyfin, Nextcloud, Navidrome and Wireguard on Containers on my old laptop. So that would be my suggestion.
You could install CasaOS and/or Portainer, on top of Debian if you want an easier way to manage your server and containers.
Markdown (there are plenty of editors to chose from) + Pandoc (to generate the output in multiple formats), would be my recommendation.
I use my old laptop as a server, and so far no issues with leaving it on 24/7
That's a very specific use case that would need you to provide more information, like what app are you using and what trackers are being reported, and that I particularly don't know if I can help you with.
Maybe if you post said information, someone else can help you.