The recent story about them switching to self hosting makes me feel like they are a particularly efficient project that will not waste donation income.
Are you referring to the Zig compiler switching to become self hosted [1], or the Zig website switching to becoming self hosted [2]? (I assume the latter.)
Probably referring to Zig migrating away from AWS to become more cost efficient [1]. This was also mentioned in the announcement regarding this donation from the Zig Software Foundation [2]
They better sign their packages and check for signatures upon download and installation. At their scale, foregoing S3 means they have to figure out how to deal with bit rot in packages themselves.
They're self hosting docs and Zig releases. There is no central package repository. The decentralization (similar to Golang) is one of the things I like about Zig.