Isn’t that just part of the cost of doing business? Not all transactions need to be lucrative. The only reason Shopify thinks they can get away with it is because they’ve grown enough that small artists don’t have a choice but to suck it up.
You're dealing with a bunch of people who will try to rip you off, so you need to have anti-fraud protections. Then you need to be able to override the anti-fraud protections because Alex, Alex and Bob, Alex, Bob, and Curt, etc. are all legit performers who want the payments to go to one common bank account even though you'd like one act == one bank account. Etc.
I'm not sure what's the problem here, to be honest. Alternativelly the platform could also charge withdrawal fees, making small withdrawals pointless.
Afaik this minimum withdrawal concept has been the standard way of doing business when reselling digital goods. See e.g. the aforementioned AdSense which has been set up this way for 20 years now. The same goes for Steam, once again you have to sell $100 worth of stuff to get paid.