> let textString = `hello`

I think further obfuscation could be possible by uglifying the script and providing a SVG path that stores the text as some vector image.

Self modifying code could be useful too, to delete the SVG data once it is in the canvas.

I fully expect this to still be defeated by AI though, such is my presumption that AI is smarter than me, always. It won't care about uglification and it would just laugh to itself at my humble efforts to defeat Skynet.

Regarding practical applications, nowadays kids sell weed online quite brazenly on platforms such as Instagram. Prostitutes also sell their services on Telegram. It is only a matter of time before this type of usage gets clamped down on, so there may come a time when this approach will be needed to thwart the authorities.