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Actually, you can donate here: https://www.wireguard.com/donations/ -- hopefully with similarly low friction.

Even better to go this way; no Apple tax.

For reference, on $3.99, Stripe takes ~10%, Bitcoin ~3%, Patreon ~12%, and Paypal ~15%. Apple takes nearly 30%.

Doesn't stripe usually charge 3%?

3% plus a flag of $0.30 from memory?

It wasn't hard to check so it's actually 1.75% domestic cards (Australia) or 2.99% international, $0.30 flag fall.

On $30 that is $0.83 - $1.20, or 2.75% - 3.99%

Look at that I completely used the wrong starting figure...

On $3.99, this is $0.37 - $0.42, or 9.27% - 10.51%

Offer an in app purchase as donation. Low friction flow for iOS users, free money for you!

Not necessarily. The reviewers may get upset if two apps are too similar.

More importantly, Apple might.

Not if you claim that the apps are exactly the same in the description in thestore.

You'll still get people complaining, it's the nature of user reviews.