We're Lemmy.tf, not .ca, but as of right now we don't have a stance. If and when Threads federates we'll have a poll for our members to decide whether or not to block it. I personally don't care to see or interact with any content from Meta services but I'm also not going to exclude a large amount of content unless our members want it blocked.
For what it's worth, I have most of Meta's domains blacklisted in my local Pihole and would cast a vote to block them in a poll. But I also think everyone may be overreacting a bit, Meta won't have any way to snoop on private user data aside from that of their own users.