Luckily, unlawful termination doesn't require proof beyond reasonable doubt.

So if the employee was fired on the spot, that would pretty much guarantee a win in most states unless the boss could show that they had already planned to fire them before they shouted "unionize".

If the boss fired them a month later, that would be a different story. But yeah, the rest of that is valid.

I believe the post above yours is missing a semicolon or perhaps a clarification, so it should read something like:

I won't be buying or using Sync, as its pricing is prohibitive; and ads (in general) sometimes include malware.