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> We should not be sharing their contact information online. So, keep your contacts in a different database. This app saves contacts in its own database seperate from android contacts. This way no other app would be able to access contacts.

https://f-droid.org/en/packages/opencontacts.open.com.openco...

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Everyone's contacts are already out there on the internet, the cat's out of the bag and you can't change that by going way out of your way to keep your copy air-gapped. The real issue is are you getting value in exchange for handing over your data? Amazon's service isn't something that normal people use to contact friends and you can't get usable directions to a contact's address with Alexa, so IMO the ROI is pretty bad.

Any suggestions for what to do on iOS?

Unfortunately, it's not always so easy to not share contacts with certain services. For instance, WhatsApp works just fine with a telephone number but it actively encourages users to upload their contacts - assumably consumed by (the) Facebook (group of businesses) as part of its social graph.

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