Even if a venue isn't owned my LN, they still use TM for ticketing because otherwise their booking agents won't be able to get the Clear Channel artists to come. It has been that way for a LONG time. Before LN, it was CC.
Source: I used to own a night club in San Francisco.
"Founded in 1996 by Robert F. X. Sillerman as SFX Entertainment, the company's business was built around consolidating concert promoters into a national entity to counter the oversized influence of ticket behemoth Ticketmaster."
It's kind of amazing how the present distorts our perspective of the past.
It was formed to compete with TM, because TM had too much market power. In other words, you didn't need to use TM if you were using CC from a business/monopoly standpoint --in fact it was against their interests. However, CC/LN often went with TM anyway because it worked out better for them.
No, LN was spun off from CC and after years of trying & failing to compete with TM, then acquired TM.
The point being: TM already had the market power before LN was on the scene, and all of LN's market power wasn't enough to get people to use their ticketing platform instead of TM. Saying LN is the reason everyone uses TM is very much getting it backwards.
Source: I used to own a night club in San Francisco.