According to Blizzard’s Public API, only teams above 1500 are being counted towards “top 0.5% top 0.1%” calculations. You can query it yourself here.
These websites show the ladder and the cutoff for easier viewing
In real TBC and in WotLK, any team with 10 games played counted.
For some reason they’ve cooked up something custom.
Now, I’m all for tighter competition - but… some of Blizzard’s own tournament winners don’t even make the cutoff for R1 because of this. Heck some don’t even make the cutoff for Glad. And those guys have lots of alts and lots of teams taking up slots.
Idk, doesn’t seem accurate to the game or fair in the era of streamer alts