This is a real misuse of the common definitions of "top, bottom, switch".

The common use comes from either the male gay community or the BDSM community. I've never seen these terms used as a description for who initiates non-gay or non-BDSM sex.

Another term for BDSM sex is "power exchange". The roles are explicit, at least in the moment.

When it comes to male gay sex, the terms are usually used to who receives penetration and who does the penetrating.