eTA not used, any negative repercussions?

Hello everyone,

Wife and I got family in Australia. I know this is 'catastrophising' a bit, but our folks are worried about the war spilling over into Europe.

So I thought, couldn't hurt to apply for eTAs for a worse case scenario/just in case kind of thing.

However, don't know whether we'd be able to use them within the year they're valid for, as we both busy with work. (We'd love to for hols, but could easily not happen)

Does anyone know if an eTA is like a visa, and if you don't use it after applying, they deny the next one?

Any advice appreciated.

Joe