this is simply untrue memes that are not watermarked are s…

All the great memers have never put a watermark on their own memes. People generally don't create memes for money or to gain fame from them. Plus, you want ppl to steal your memes, that's how you know they have gone viral.

how about making the watermark invisible via steganography? Platforms that recognize it can credit the author. No 'ad' feel

I'm not sure, I just think ownership of creation is important

Banksy doesnt need to sign "banksy" to know its a banksy.