It doesn't sound like such a bad idea until it's applied to people/businesses with your beliefs.
The law as written goes far beyond a mainstream political belief. There is no civil reward for turning in or reporting or suing a child rapist, serial rapist, a pedophile, a child abuser or a cannibal or a serial killer, much less someone that assisted them. None of these are legal activities in any state or country.
But you can report someone helping someone else get an abortion and you get a minimum of $10K? That's a full degree of separation from an abortion and is an indirect 'crime'. Is that 'crime' somehow way worse than all the direct heinous crimes that I listed that we have to allow civil litigation? Abortion is legal in large parts of the world. What about women who get unfairly sued? How do you prove you did not have an abortion? Who's going to pay for the lawyers to defend them? Is there a precedent for this apart from autocratic regimes where people are supposed to watch others?
I'm not defending the law, but it seems it's written like that only because the Texas legislature has been prevented from legislating directly to address what they see as a legitimate issue, unlike in the other areas you listed. The law's structure is a kludge to get around that limitation.
You'd probably see similar kludges if the Supreme Court set similar permissive precedents in the areas you listed or areas of polarized moral sentiment (e.g. gay conversion therapy).
1. This is not a mainstream political belief. The law at the root of the current issue in Texas is far beyond the mainstream. The intention at some level is to shift the Overton window of what is mainstream in its favor, but that has not occurred yet.
2. It's not my responsibility to educate this guy to my point of view. I don't know him and I don't work with him. Actually the only thing I know about him is that he doesn't respect the rights of others that I feel are important, so I'm doubly disinclined to make his acquaintance. I would presume that some amount of discourse did occur within Tripwire, but I don't think we know.
3. I'm allowed to vote with my dollars. It doesn't have to be a glorious public crusade, and it may not make the slightest bit of difference. In this case, it certainly won't. But those dollars work for me, and I can choose to deploy them so as not to (tacitly or actively) support people or business who wish to harm myself and people who I identify with. That's what I have chosen to do, and others should make their own choices.
4. In a different scenario, I might indeed feel differently. I don't find that the slippery slope is a solid argument for why I can't take (lawful) action to preserve my values though.