I think one can be "open" to a fault. If you cling to principles and morale for the sake of it and without exception or nuance, you set yourself up to be exploited or worse. Many things, entities, interactions in life contradict each other and it is important to set boundaries and make decisions for yourself. Because life and people are multi-faceted and aren't nice and clean and perfect, which blind, naive idealism fails to take into account. The keyword here is nuance.

Many big tech companies run on greed and inhumane, unhealthy, invasive practices for the sake of pure, blind, unsustainable growth and profit. And I would argue that this is one of the driving factors of the fediverse even existing. If you don't clearly separate yourself from these practices, then we all can simply use Reddit. But people create, maintain and use alternatives for a reason. Not taking a stance or action against what you want to escape from, even openly inviting it for the sake of being open and on a morally high horse makes simply no sense.

Idealists won't like to hear this, but it's the same with peace. Look at Ukraine to have a recent example. Most people want to live and prosper in peace. That is natural and desirable. But there are always some, who profit from war and who try to destroy things, disregarding the fate of others. Or political systems that want to expand territory and exploit / convert whole populations. When the desire for peace is only one-sided, and all attempts of talking or peaceful incentives fail, you can either protect yourself forcefully or be stolen from, raped, tortured, deported or murdered, watching your homeland be turned into ashes and those you love suffer for decades from the consequences.

In the same way, when the desire for openness, humane fairness without exploitation of users is one-sided, you have to draw a line and take a clear stance to defend that "safe space" you seeked in the first place from entities and principles that contradict it. And we have decades of clear evidence how big tech, especially Facebook / Meta operates, they are known to invade user privacy, strive for one-sided power, try everything to avoid or circumvent legal regulation. They have more than earned to be excluded from a place created to offer something better, healthier. And it's not like we hurt feelings here, it's a corporation, a virtual, soulless entity.

I can only speak for myself and do what I deem is good for me, so I'll migrate to Lemmy.ml, because at least they have the balls to stay true to a concept, even if it involves difficult or ugly decisions. And even if blocking Meta won't fully "protect" the fediverse, at least it is a clear message and limits the amount of power they can achieve and the amount of damage they can do here.