Sorry to hear, but you are not alone [0]. It was matter of time for a new tech to be exploited like that. Providing IPFS gateway is like opening up public HTTP proxy (popular back in 90s). You had good intentions, but there will be lot of nasty things going thru your machine. Of course guys like Cloudflare can absorb arising liability but I think they will shutdown their gateway at some point.

I think the best way to popularize IPFS will be out-of-the box support in major browsers. I think Mozilla may be the first one here.

[0] https://www.bleepingcomputer.com/news/security/phishing-atta...