This will likely be rejected for one the same reasons that they decided they would not add any new flag emojis. Flags come and go. Bitcoin hasn't even been around for 20 years yet, and its future is highly uncertain.
Also, considered as a currency, it would be better as a regular text character, not an emoji. Like $, €, ¥, £, etc.
This doesn't seem to be a problem with disaster recovery plans. It is perfectly reasonable for disaster recovery to take several hours, or even days. As far as DR goes, this was easy. It did not generally require rebuilding systems from backups.
In a sane world, no single party would even have the technical capability of causing a global disaster like this. But executives have been tripping over themselves for the past decade to outsource all their shit to centralized third parties so they can lay off expensive IT staff. They have no control over their infrastructure, their data, or, by extension, their business.
Honestly, I don't find this very creepy. This is information you are already putting out there for everyone to see. If I post a video of myself speaking, I am not concerned about people seeing how my skin vibrates in that video.
As video generation tools become more advanced, we will need better algorithms to validate videos. The bar for "fooling the vast majority of humans" is much, much lower than the bar for "being literally indistinguishable from a real video". The main problem I see is that it's going to be a cat-and-mouse game, and I don't think any method you publish will remain valid for very long in practice. The same method will be used to improve the next version of video generators.
Also, lots of real videos use post-processing that might wash out some of the details they are looking for. Video producers might re-record lines so they don't perfectly match the video to begin with. It's been a while since I long time since a Samsung phone, but on my old S6, I remember that it always had a beauty filter applied to the selfie camera that made me me look like a creepy porcelain doll. I could probably make a deepfake of myself that looks more "real" than those real videos and photos.
I don't know about strictly "unable" but there are a million contexts where it is a bad idea and simply not done. Like a spreadsheet or financial document. Or anywhere you want your text to behave like text — with a consistent font, color, style, etc. The difference between $ (text) and 💲 (emoji) is pretty stark in most contexts.