And what grounds would they have to enforce that suit? Break Texan law by not doing business in Texas and not having any Texan assets: how enforceable is that?

Texans aren't known for their intelligence...

>If a company offers a service but intentionally excludes people from Texas (or any part of Texas) because of where they live, that person can sue here for damages.

This is a pretty wild concept. So if I am a citizen of, for example, north carolina and I decide that I simply don't want to sell widgets to citizens of Texas can I be sued for breaking a Texas law? Do you have a link to somewhere that spells that out? Not that I don't believe it, I'm just not sure how that could ever be enforceable. Are they going to put texas police in a car and drive to North Carolina and arrest me? Sieze my non-existant texas assets? There is no Texas FBI with jurisdiction outside their borders. What possible penalty could I have for simply ignoring the lawsuit?

The simplest answer is that the state can prevent the company from doing business here at all, just like how China cuts off non-conforming platforms. This effect could echo into other states, just like laws in California often anticipate nationwide changes.

A state ban on a nationwide company could also extend to its vendors and customers, so platforms could be cut off from advertisers and suppliers here. This technique has also been used in CA and in Europe to widen the compliance net.

The comparison of Texas and China is getting more and more apt every day.

But surely if my goal as a company is to not interact with Texas customers due to restrictive or objectionable Texas legislation, not letting me do business in Texas is 'threatening me with a good time'?

wouldn't that person also be opening up themselves to felony CFAA charges by using a system in violation of the terms of service?

/s