“We’re aware of reports that access to Signal has been blocked in some countries,” Signal says. If you are affected by the blocks, the company recommends turning on its censorship circumvention feature. (NetBlocks reports that this feature lets Signal “remain usable” in Russia.)
Well, one is used as a massive government data collection tool, another does the same thing for private corporations and is profitable.
Profit. That’s why many refuse to make it standard.