Since I'm the one who sent you that warning, I'll respond, although several others have already addressed the salient points.
One of my jobs as a moderator is to enforce the rules the moderating team has established to try to keep this forum running smoothly. When I do so, I do not pay any attention to whether a member is a supporting member or not. So, no, being a supporting membership does not give anyone the right to violate forum rules.
As to your "joke" about the pandemic. I find it one of the saddest developments of our time that our nation's response to a pandemic that has killed millions of people worldwide became a politically divisive subject. That division fell along political party lines, and one of the triggers was the wearing of masks. There were those who felt the pandemic was not real. They rebelled against wearing masks, and ridiculed those who did by referring to them as face diapers. So, when you referred to "N95 scamdemic face diapers", I took that as a political reference that could incite one of those divisive arguments among our members, so I deleted it and sent you a warning not to repeat such references. I would do the same whether you were a supporting member or not.
What you refer to as censoring free speech, I see as enforcing forum rules intended to keep our discussions on the topic of refining precious metals. The fact that you say you "have been repeatedly banned from far more popular platforms for refusing to speak as others prefer me to speak" indicates that many other forums agree. There is a saying that "the one common element in all your past, failed relationships, is you". If you have repeatedly been banned from other groups for the things you say, perhaps you should reconsider the things you say. It is one thing to exercise your right to free speech. It is another to intentionally offend others because you consider it your right to do so.
Everyone in the U.S. has the right to free speech, but there are restrictions. No one is allowed to yell "Fire" in a crowded theater if there is not a fire because it could induce panic that could cause injury. Our rules are intended to keep the forum running smoothly and on topic. I will continue to enforce those rules equally whether someone is a supporting member or not.
Dave