There are many alternative options to store those phrases online, without anyone even noticing it.
You just need to camouflage it a bit with clever techniques that will conceal it's real purpose. (Using templates and splitting it into many pieces that only you will be able to decipher)
Of course it's possible. But if enough people do this, I bet some of them lose their money, while others are unable to recover their seed on their own. And that's why it's generally not a good idea to create your own "system".
Some people stay in areas where natural disasters are more prevalent, so you cannot store this in one geographical location.
Even a safe deposit box in a bank far from your home would be a better idea. Or 3 safe deposit boxes, each storing 16 out of 24 words.
I agree; never roll your own crypto / encoding schemes! Over the years, I myself had to re-check my seed backups to even remember which backup belonged to which wallet. And these are just regular old
steel washer and steel plate backups of BIP39 seed phrases.
Only issue is as with all 'custom crypto' (
don't roll your own crypto), if let's say you pass away and your family knows nothing about this scheme, they won't randomly think to unzip a file from your cloud storage, take the image that is hung in your office and pass it through a program from GitHub to restore a Bitcoin wallet.
Instead, if they find some paper with 12 words, they might look online and find out this is a Bitcoin wallet seed.
Of course, you yourself might also forget how you generated that wallet if you find your backup again after decades and maybe already have symptoms of dementia.