To clarify Marzia lore, when the bridge happened she didn't really comment, while Pewdiepie was doing all the apologies, but few years later when Floyd happened she was posting pro-blm stories while Pewdiepie barely post anything if I recall correctly. Marzia's haters still were displeased because it is never enough, however nobody could say they haven't "spread awareness". Compare this to Jomha's never ending apology tour.
As for her going away from social media, Mussolini dog contributed, but so was her failed attempts to sell shit. Marzia's business endeavors were, let's say, mildly annoying. She had a subscription box with cosmetics and stuff, but the terms were badshit, basically you could not just go and buy a box if you like that month's content, you needed to sub. And if you want to cancel the sub, you needed to jump through the hoops, call somewhere, which is a fun part if you aren't in her timezone, yada yada.
Biggest fail was a jewelry line which she priced incorrectly and made it too cheap, sold it and got zero profit, realized that, made a post about it, doubled the prices, which didn't really contributed into people's urge to buy anything, and not long after that it died and she closed her wordpress blog for good (that was her main place for posting detailed information about all that she was doing, after jewelry fiasco it was gone). The pottery store was her best project, she was doing clay stuff herself, some of her relatives were selling their crafts as well. This one crashed and burned because when you have 2 hands and 24 hours a day you can not produce enough pottery for literal millions of her own + pewdiepie's fans, so that store is always in sold out stage. I would say she really has no idea how to do business, she either fails basic math and we get jewelry/pottery situation, or just outsources everything to some sleazy schmucks and we get a box situation. All these however are products of stupidity and not malice in my book, but since she is attached to a fan/hate base this big, you can only imagine the harassment she is getting daily. No wonder she quit, even when she wasn't doing anything even mildly controversial, people were picking apart every single bit of her online presence. And when she did misstep, oh boi.