This used to be my go to then I had trouble with redemption of unclaimed gifts. Haven’t used them since 

BlokchainB

https://lightsats.com/

In order to receive the gift, the person needs to do some Proof of work.

If they don't do it, the SATs would go back to you. So, if they don't claim it, you don't loose anything.

bitcoin_beginners

I want to give a small amount of bitcoin to someone - some advice on details?

Signal312

https://lightsats.com/. This is a great option. 

In order to receive the gift, the person needs to do some Proof of work.

If they don't do it, the SATs would go back to you. So, if they don't claim it, you don't loose anything.