It’s often tempting to say “this X is screwed, let’s start all over again”. But deep relationships are not formed that way.
Between any people, there will be points of tension, and if this calls you to quit, you risk never to get to the point of stable long-lasting relationships.
May it be that they need to break up? Yes. Does it have to be? No.
Linking Microsoft and allowing them to read into everything you write is a massive privacy hit.
But their target audience is indeed not the privacy-minded folks. It’s still an unfortunate precedent of Microsoft mandating the use of OneDrive and injecting ads, which may get worse and even get included in some form in paid products.
There are two types of thinking about it:
As much as political differences matter, you will not change his mind by not going - but your relationships will get much, much more bitter, and it will be hard to rectify. Many people went through this mistake, and it costed them a lot.
Honor his wedding while keeping to your values. This event has nothing to do with them.
Some apps and front ends support showing your post and comment “karma”. Eternity, for example