Viral, perhaps if you integrate a library, but in this case it doesn't make sense, you only need to distribute source code if you modify it. Poisonous makes no sense to me, can you clarify?
https://www.merriam-webster.com/dictionary/poisonous
1. DESTRUCTIVE, HARMFUL
...
3. SPITEFUL, MALICIOUS
In what ways is the GPL or AGPL destructive or harmful or spiteful or malicious? I find it the exact opposite of all those concepts.
I don't typically make my decisions based on what businesses "universally decide" (have they actually?). Most businesses are shareholder or private corporations that find margin between labor and sales; I instead structured a business as a co-op and that seems to be working just fine. Many businesses profit off polluting the environment or selling weapons; I've never worked DoD or O&G (and never will) and lead an extraordinarily comfortable and privileged life regardless. Many content creator businesses lock their content behind paywalls, riddle their sites with ads and tracking; I put up a simple blog in html and css and my audience might be small but they are engaged and are in conversation with me.
I'm not trying to say i'm a special ethical snowflake that's better than everyone else, I'm saying I don't really take it as a given that "businesses doing things in a certain" way really means much of anything at all. In fact I've found often profit correlates with harm (and that businesses often make decisions that don't lead to long, long-term profits but rather pillage themselves for short-term profits), O&G being a great example, so I might even be able to take "businesses do it that way" as a warning to not do it that way or I might be hurting people.
I don't care to continue the conversation where you justify your actions to me, it's just not necessary. I just wish we would stop acting like it's confusing or we don't understand why businesses respond the way that they do when confronted with the decision to use AGPL software.
Maybe it's just a messaging/marketing problem, I don't know.