Constant Repeated Phishing warnings

Every time I am shopping for assets this past month, I get my connection interruption by a phishing warning from my antivirus about s3.amazon.aws. com  This also happens sometimes when pulling images from my marketplace inventory in-game, making maps.  What's going on? I'm aware that there are phishers that mimic Amazon services to phish. This is only happening here, not on other sites, not even amazon. Is roll20 compromised?

Probably not (compromised), what is probably happening is that your anti-virus is being overzealous. Roll20 is not a "single website". It stores data on other services, like images on Amazon. However, to be sure I suggest sending a bug report into the Devs via the Help Center . The forums are primarily users helping users, the Devs will be able to look at console logs etc. to see if anything hinky is going on.