Freeland has a LOT of ties to Ukraine and Russia,
https://en.wikipedia.org/wiki/Chrystia_Freeland
So what's her reasoning for stirring the pot and causing trouble? I'd venture a guess she didn't think Trudeau was doing enough to help Ukraine...
That resignation and disagreement opened up the Cons and NDP to try and steal the spot light.
1 - You can block/ignore entire instances. (spamming ones)
2 - If it gets big enough, you'll see legit instances band together and federate only among themselves (white-list, invite only to allow federation)
people will gravitate to these groups of instances if they are well moderated and keep that crap out.