Fairly sure this is wrong. The point was to create a mechanism to sue various people "in orbit" around an abortion without involving state officials. This was supposed to "immunize" the process from any Roe v. Wade-related block.
With Roe v. Wade now struck down, Texas can basically do whatever "it" wants w.r.t abortion, and the federal government cannot intervene. SB8 at this point is possibly (just possibly) a way to reduce state spending on abortion legal cases, but not much more beyond that.
It's directly (and I believe explicitly) modelled on the Americans with Disabilities Act. The ADA creates a model in which private citizens can and do bring lawsuits against all types of organisations for any type of harm they can define.
This has spun out a cottage industry of disabled people who's full time occupation is visiting everything from websites to restaurants, being harmed and bringing lawsuits. While that may sound like a bad thing, it is in fact a very very cost effective way of enforcing the law quite effectively without bureaucratic bloat. Strangely, it's been quite successful. The history of why this decision was made is very interesting.
For all your devs, this is why large American companies care so much about accessibility on their websites - because it creates an almost unlimited liability on their end if you do it badly. Companies now scan websites for accessibility as soon as they're launched, then others will buy the set of companies which 'fail', then visit those sites in order to be harmed. It's an interesting little cottage industry which keeps legitimate disability rights enforced quite nicely without too big a government.
As a private plaintiff, you can typically sue a state official that is charged with enforcing a law in federal court on constitutional grounds. SB8 is written in such a way that state officials are barred from enforcing the law. Thus, it is effectively impossible to challenge in federal court because there is no state official that enforces the law, only private citizens, and thus there is no proper defendant.
My impression is that it fits the pattern of trying to disrupt society and government and create a vigilante citizenry, similar to encouraging people to arm themselves and use their firearms to prevent crimes.