We do not collect any information about any of our users in any app. We are not interested in storing your personal data, and any apps are designed from the ground up to avoid storing any information.
Specific apps:
Pomelo Tree Sticker Packs: a short code is collected when a sticker is used, such as M0102. The letter tells me this was used in Messages, 01 is the sticker pack, and 02 is the sticker. As you can see, no identifiable information is included.
Lens Cap: nothing is collected whatsoever.
Apps and Living 
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