I won't throw shade at them for it, it's capitalism. It encourages other companies to undercut it and to compete with it. It's how the system has always worked, and it's why both Intel and Apple are trying to outcompete each other (to our benefit).
That being said, I have a feeling Apple may have priced the storage upgrades too high for their own good on the Mac Studio. They might have honestly priced them even higher than the market could bear, and they are probably leaving profits on the table. I certainly wouldn't pay those upgrade prices when I could very easily pay half the cost for a Samsung T7 or something that I could just throw onto the thunderbolt port.
Sure, the built in storage is 7GB/sec, and that probably benefits a lot of users for an OS drive. But for storage expansions, external alternatives are pretty freaking attractive and are more than fast enough for most users. Especially when I can just throw it under the desk and have it out of sight entirely.