Sure, of course it’s better with people who have a phenylalanine allergy, lol. That’s like saying peanut free candy is better for people with a peanut allergy.
The kidney thing, I’ll note that your source says it “may be” better, but it’s also worth noting that aspartame has had 50yrs of studies against it, and in huge volumes (largely driven by the sugar lobby in the 80s and 90s). It’s the most studied food additive in the history of the FDA and has never been meaningfully linked to any sort of major negative health issues.
The acceptable level of intake for aspartame is 50mg/kg vs 5mg/kg for sucralose, and the list of potential side effects is shorter, with sucralose including “diarrhea” and “muscle aches” in the list.
In addition to the other listed reasons, going open source is an extra step.
The code has to be compiled to run on your system (if it’s written in a non-interpreted language, which a huge portion of software is).
You can’t just run the source code on your computer. And getting your customer’s computer to compile the source code itself would require a massive amount of overhead.
So, to distribute your software, you’re always almost always going to distribute an already compiled version, and you’d have to choose to give the customer the uncompiled version as just a separate thing on the side. And there’s no real reason to do that for most companies.