"We don’t allow Patreon to be used for funding weapons or military activity."
What is this then?
https://www.patreon.com/search?q=guns
If the Iraq war had happened today, would you be able to use the same arguments for patreons who collect money against the British and US invaders who used imaginary WMD[0] as pretext?
I believe it is very clear that it is impossible for legally operating institutions to collect funds for wars without direct governmental involvement or blessing as these are complex matters that you don't want to end up on the wrong side when things settle. The Iraqi WMD were found to be imaginary much later, not at the time of operations and in this alternative timeline, Patreon could have ended as the company that facilitated the collection of funds for WMD operators.
It's very different from facilitating the collection of funds for creation of weapon related media. No person in right mind would want to be involved in collecting funds for armed conflicts unless actively takes sides.
Even humanitarian aid is risky as it is often used as a cover for military operations, so you will need solid guarantees - preferably from the state actors that you are abiding with.
Perhaps they should have obfuscated what their intentions were.
Where is the 'call to military action' or 'call for violence' with guns or anything that is funding an active military campaign in your link? There is none.
This is a 'private platform' doing private platform things and they can decide to do business with whoever they want to and will point to anything that breaks their ToS.
Don't like it? Use cryptocurrencies for donations then.
Even as Whataboutism goes that's pretty weak sauce.