I want to clarify that prior questions were about the interviewee contacting the interviewer. This question is about the opposite, where the interviewer contacts the interviewee.
I had an initial, video conference interview with someone from a large tech company to which I had applied. The interviewer said they had received my resume from a few different sources within the company recommending me for a position that was going to be created soon, but not yet public.
I think the interview went very well; we connected, we both asked the important questions and got a better understanding of each other. A day later, I received an unsolicited invite to connect on LinkedIn. I have no idea if the invitation is because they are considering me for a position, if they are seeing if there is anyone in my network who might also be a good fit, if the interviewer is just expanding their network, or something else.
Is it appropriate to accept a connection request from an interviewer the day after the interview, with no context as to whether or not they want to hire you?