but depriving them of that in a disorganized way doesn’t actually cause them to change their methods.

Nonsense. That’s not how business works. A disorganized boycott lacks an express list of demands. That does not mean the oppressor does not know what drives the boycott. If they know what the issue is, the business case wins.

More importantly, as explained in detail, behavior modification is not the only goal. I have no demands for Microsoft. MS is unredeemable. There is nothing they can change to reverse my boycott. The boycott ensures that MS gains no revenue from me. MS loses the empowerment of the capital they would otherwise acquire from my patronage. I am free from serving as an enabler. I force other people to feed Microsoft’s competitors. If they want to talk to me, they cannot use outlook.com.