At the risk of creating a monster, if how your text looks is more important to you than the content itself, I guess you could render all your text to an image and share that. Though, I’d suspect you’d end up in quite a few blocklists because people generally prefer to have their own preferences rather than someone else’s on their own devices.

Regarding the Samsung tablet font situation, a few things:

Firstly why they are sold, commercial fonts kinda generally cost money, I won’t get into how Monotype is basically operating as a cartel, but foundries own the designs of fonts and they license them to operating systems at a cost. Apple and Microsoft bundle the cost of the licenses in with the price of their software/devices, Samsung decided to not do that and pass on the fee to the users that specifically wanted them. Not saying it’s good or anything, just explaining why.

Secondly, doesn’t Samsung offer some free? I’ve not used a Samsung device in years so I might be misremembering, it wasn’t an incredible selection, but there were a few fonts for each of the main typeface categories.

Finally, if there isn’t a current root exploit already for the device, it never used to be too long before someone figured it out. Once that’s possible it was always pretty trivial to add in custom font files IIRC. Have a dive on the XDA forums and see if anyone’s working on your device