The section of Texas Law providing for businesses to post their property against concealed carry licensees is section 30.06. The required sign is .. um... rather large.
The letters must be at least 1 inch high in block letters in contrasting color. It's an ugly thing. Some cheat and put it in white/translucent letters on clear glass.
But most of the signs that went up initially, both legal and non complying signs, have come down over time. It's pretty easy to avoid those businesses that don't want your business, because there is a competitor who does.
The biggest factor in that was not the business loss, but increase in potential liability. The businesses have been informed, often by their own lawyers, that if a CHL holder is harmed in their business because they were required to be disarmed, the business will be liable for damages, and they won't be able to get anything from the criminal to offset those. That also goes for anyone else who would have been protected by the CHL holder.