KLAF wasn’t a startup; it had previously been affiliated with UPN and MyNetworkTV, before Nexstar (prior to selling KADN/KLAF to Bayou City, DeJuan McCoy’s original broadcasting venture that cashed out to Allen, amid the Media General purchase) switched it to NBC, and built the joint news department with KADN.
The “de facto affiliate” model wasn’t viable long-term, anyhow. It primarily relied upon cable and satellite coverage to be sustainable; The WB 100+ started the shift toward creating local affiliates for networks to fill gaps in market coverage that the Big Three and Fox (the latter of which it kinda pioneered through the Foxnet cable network) expanded upon, using low-power stations and digital subchannels for that purpose. Even in the analog, pre-cable era, issues with rimshot signal coverage of the supplementary affiliates made it difficult for some viewers to watch network shows from adjacent-market affiliates.