I don't know exact figures, but when Tiktok was banned, Instagram was really popular - due to being pushed by Facebook, which was really really popular in India by then. None of my friends were on Tiktok, but all where there on Instagram. The reels thing was not popular but Facebook linked the account automatically and you just keep adding Facebook friends there as well.

Tiktok had a better algorithm (to get hooked) but Instagram eventually caught up (with algo)..