By the year 2050 digital consciousness has become ubiquitous. Outside of small groups of bio-Luddites and discontents, anyone who has the means has uploaded their consciousness to the Cloud. Having one's consciousness reside in a biological body is seen as inconvenient, and an unnecessary risk and expense. Who wants to risk death without a backup? Who wants to spend money on sustenance when CPU cycles are so cheap?
However, many of the digitals still want to occasionally inhabit a body, for entertainment, nostalgia, or reproduction - the finer details of early brain development haven't been quite worked out. Bio-food and bio-sex are some of the more popular attractions afforded to the middle and upper classes.
There is fierce competition in the Body-as-a-Service space. Most providers offer a free usage tier that lets one use a random body for a few hours per month at no cost. For a reasonable price, at a moment's notice, one can rent an unused body from a BaaS provider, billed per second of usage. For a higher fee, one can acquire a dedicated body. For a truly outrageous fee, in some of the less discriminating jurisdictions, one can get a disposable body, for purposes better left unsaid.
Of course, these bodies need maintenance. Contractors take care of the less pleasant aspects of sustaining a biological body. With a few clicks, anyone, even bio-people, can sign up to a body-tasking platform and earn a few bucks to perform hygiene and medical procedures, exercise, and so on. The platform is popular in some of the poorer countries where many bio-people reside.
A bio-workforce is also required to perform ad-hoc physical tasks which have proved difficult to automate, requiring more or less specialized skills.
The fruit of continuous efforts to lower the barriers to entry to body-sharing, by 2050 no implant is needed anymore to participate. One can simply sign-up and agree to some Terms of Service and receive their free body-sharing device by drone shipment.
After some incidents in the mid 40's, members of the main BaaS consortium have agreed to provide free brain-lock implants to bodies that are still the primary residence of a conscious mind, to avoid unfortunate mishaps.