Both seem to be US only. You can't even ship stuff outside of the US with lulu. I was wondering whether you can pay via resy in another country but hard to say.
There was a post on FT about buying GCs from restaurants that are on resy or something.
I gotta say that my sign up period was pretty lucky. It's likely I'll get
$300 H2 25, $300 H1 26, $300 H2. Plus the $200 Hotel credit I already used. Looking upwards of 1.1K USD just on hotel credits on a single AF. Not taking into account lulu, resy, and the airline credit.
FWIw I applied in July so I assume my AF will land sometimes around then in 26 and I should be able to hit the Q3 credits before I down grade.