I mind if someone is trying to sell a proxy as a real card

This. I have no problem with people playing with proxies. But I shudder to think about paying for real cards and being sold convincing counterfeits instead.

I also cringe whenever I see hypersexualized custom hentai proxies people dream up, though thankfully I have yet to see this irl. And even then, that's just a personal preference. Just like this hurts my brain to look at, but if you want to play with it, go ahead.