Snap Inc.’s life as a high-growth younger tech inventory is over, and its rivals are about to indicate how a lot of that change is about Snapchat.

“From our recent conversations with our partners, it seems like advertising demand hasn’t really improved, but it hasn’t gotten significantly worse either,” Snap co-founder and Chief Executive Evan Spiegel instructed analysts in response to a query about headwinds and the broader macro-economy.

Brand…