This sort of paranoic fearmongering is exactly the sort of propaganda that pushes society towards that authoritarian corporate dystopia in which trust is forced by those in power, and which you have no control over. We are slowly losing our freedom to choose even whom to trust, thanks to this idea that these "multinational corporations" are somehow deities.

You highly underestimate the skill of the community, and how it only takes one person to find out and spread the news if something is amiss. Source isn't needed, and doesn't tell the whole story anyway. (See: Ken Thompson Hack.)

the multinational corporation that could lose hundreds of billions of dollars if they inappropriately abuse my privacy

The corporation which has lawyers and knows exactly how to spin their spyware to carefully evade such laws?

Windows 10 would clearly be considered spyware 10 or even 5 years ago. Yet somehow Microsoft has convinced the general public that it isn't, and we are supposed to still trust them?

Edit: downloaded it to take a look. Appears to be written in easily-reversible .NET and not even obfuscated, so go ahead and analyse it yourself if you don't trust it. (If it was obfuscated, that would make my suspicion jump.)

Edit2: looks like people still think I'm wrong - go look at the binary yourself instead of blindly downvoting just because you don't want to do the thinking yourself. The more power you let them have, the more they will abuse it.