Has anyone else been getting bad keys from DailyIndieGame lately?

Given the way the site has been progressing in recent years, I'd definitely think it advisable to hold to a bit of caution in regards to how much you invest into the site at once. We've had plenty of other sites die overnight over the years (and I can think of several where unclaimed content was lost) so, even if we don't think it likely, that's a possibility worth keeping at least in the periphials of one's considerations. I definitely think it's the right call to pull a "better safe than sorry" any time a concerning issue arises.

That said, their support team seems responsive on their Steam discussion group, even in addressing other posts mentioning a lack of support response. The most recent response is even just from a couple days back (though it did have a 2 day delay on response, so do note that). Maybe try giving that a go: https://steamcommunity.com/groups/dailyindiegame/discussions/0/

Haven't used it lately, but I bought atleast 200 keys before, no dupes.

https://www.youtube.com/watch?v=JNJMIbNkQZU one more to complete your pool.

Not sure if I even bought there once.

Not recently, only 1 a few weeks ago and they gave me a new key after 1 ticket and within a few days.
I got 163 games from them.

Note they seem to be buying and reselling bundles themselves too, so maybe they just got a bad batch or keys that got revoked by a dev.
Why in my case i would have opted for refund thinking i would get another bad key again, but they just gave me a new one that worked.

What Justducky says maybe they are on a holiday (though it be nice to know if such sites would give a notification).