I'm not sure if voiding all the other bets is the best policy to take here.
They seem to be in a real rush to close this entire operation down which makes me wonder if they have run into trouble with some sort of authority/regulator.
I think that the more transparent thing to do is probably let all of the bets settle, and simply not allow any new bets to be placed. Instead of voiding without warning all the bets that have been placed (potentially years ago on long shot events).
With Pinnacle odds they might have had offerings for things like the 2024 presidential election or "Organization to put human being on Mars first?", both of which have an end date that's very far out. Bettors with those bets would probably prefer getting them voided so they can be placed elsewhere, instead of hoping that a site that's no longer maintained will exist in 4+ years. I hope no one ended up getting screwed with an outright bet though.
I also read that they have a 1mBTC minimum withdrawal, Therefore, many may not succeed in withdrawing those amounts.
I think they shouldn't do that since it's already stated here.
All funds are safe, and there are no reasons to worry - We will pay every last satoshi in credits.
The minimum definitely still exists (I have a 0.034 mBTC balance that I can't withdraw) though it seems like deposits are enabled so nothing stops you from depositing to meet the minimum and then withdrawing.