Companion tool for pot/jar lip products
Many buyers purchased it specifically to apply pot-type lip tints and balms (frequently naming Fwee's Blurry Pudding Pot, Dasique Lip Jam, and tocobo lip mask) without using their fingers.
Hygiene over using fingers
A recurring purchase driver is wanting a cleaner alternative to dipping fingers into shared lip pots, both for personal hygiene and to keep the product itself from getting contaminated.
Influencer/social media exposure
Several reviewers cite YouTube Shorts, Instagram, or specific influencers (including a K-pop idol) as the reason they discovered and bought the brush.
Affordable alternative to Fwee brand brush
Many customers bought this as a budget-friendly substitute when the popular Fwee silicone lip brush was out of stock, and several found it just as good or better (e.g., for including a cap).
Repeat/repurchase and travel convenience
Multiple reviewers mention repurchasing it repeatedly or keeping a spare in their bag due to its compact, capped, travel-friendly format.