harass
verb ha·rass \hə-ˈras; ˈher-əs, ˈha-rəs\
: to annoy or bother (someone) in a constant or repeated way
: to make repeated attacks against (an enemy)

Does not apply here.

ultimatum
noun ul·ti·ma·tum \ˌəl-tə-ˈmā-təm, -ˈmä-\
: a final threat : a promise that force or punishment will be used if someone does not do what is wanted

Does not apply here. Refusing to pay for a product you don't like is not a punishment nor is it forcing anyone to do anything.

People saying "ultimatums get you nowhere" must have forgotten that SE is not a person that you negotiate with in a patient manner. It's a company. There's no need to feel symphathy for it and get defensive. The words that correctly describe the situation are "boycot" and "threaten". Threatening to boycot is not immature in the slightest. It's the act of an educated consumer, who refuses to throw money at a company with no timeline of when things are getting fixed. Just google "threaten to boycot" you get thousands of examples of people practicing their consumer rights around the world. Also, there's no need for any more constructive feedback because 1) it exists in multiple threads and 2) it has been seen by Yoshi. It's up to SE to fix it in a timely fashion.