If a company sends out rejection letters to everyone that applies, is it a fair assumption they will also send them out after an interview?

I applied to 3 similar positions with a company.

I received an automated response for 2 of them that I was not selected to move forward. The other one I had a phone interview and the next day an in person interview. It went really well and I left feeling confident that I would get an offer. (Thanks for all the interview advice on this sub!)

That was on the 17th. Each day that goes by I think maybe it didn't go as well as I thought. But I also haven't received a rejection letter yet, and if they sent them out just after applying I assume they would send them out after interviews as well?

I'm trying not to get my hopes up but this job would be such a great step for me.

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