I went to the Squarepeg site trying to find out where their toys are manufactured. i couldn't find that answer, but did find out that SP claims to use 100% Platinum grade silicon, which is how they justify their price tag. They claim that platinum is necessary to make a safe toy, and platinum is expensive. Sounds good, but without substantiation, that could just be a marketing ploy. So, i looked further and found more info (again by a manufacturer) that i'll link below.
It appears to me that SP's claim of 100% Platinum grade may be a way for them to distinguish their products. The generic safety standard appears to be "medical grade" (which may only be achieved using platinum as a stabilizer such as SP implies? idk). The Aliexpress slink i bought claims to be made of "medical grade" silicone.
Bottom line (so to speak) is we don't really know because sex toys are unregulated and sellers can claim whatever they please about them. There is a line of reasoning that some of the larger companies are concerned about their reputation and more likely to use safe materials. i don't buy into that line of reasoning, history is replete with examples of large companies who claimed and advertised products as safe, and even healthy, when they were indeed the opposite (the tobacco industry comes to mind). Having a whopping big price tag because they're 'the best' is often no more than propaganda used to inflate pricing.
Perhaps if we dig deeper (so to speak) we'll find a way to determine if the products we buy are safe without having to take the sellers word for it, but at this point without protective regulation, it seems we are at their mercy.
https://www.squarepegtoys.com/support/platinum-isnt-cheap/
https://www.kinkly.com/2/920/passion-play/sex-toys/sex-toy-safety-a-guide-to-materials
https://www.dameproducts.com/blogs/journal/what-does-medical-grade-really-mean
"Kourtney Kardashian is concerned about our bodies, and she's taken her fight to Congress. In April, she joined the Environmental Working Group (EWG) in D.C. to advocate for stricter regulations of cosmetic products. You see, when products that we put on and in our bodies aren't well-regulated, then there's no way we can know that they're totally safe. That's true for makeup, and it's also true for sex toys."
https://www.refinery29.com/en-us/sex-toy-materials-safety