Something similar over $200,000 at Cleveland Horseshoe because casino admitted was due to a promotional boost to the BBJP. This meaning they simply added $200,000 to the jackpot.
Adding to the jackpot isn't unheard of either, but it's more common for casinos to take out portions of the BBJ to run other promos like "Aces Cracked" and "High Hand Bonuses". The more promos like this that they run, the slower the BBJ meter will grow. And since this is the first time that Windsor is >$200k, either the BBJ has been hit quite frequently in the past, or they have a lot of other poker promos, or take out of the BBJ for profit (usually illegal). Harrah's (now Hollywood) St. Louis only does $500 in "Aces Cracked" per day, has the same BBJ qualifier, and the BBJ is currently over $200k. The record at that casino was over $400k.
The Foxwoods jackpot gets this high with some regularity, since the threshold (quad eights) is so high. Last summer it was over half a million.