I imagine they must do this to minimize risk for certain accounts based on factors unknown to me. I don't know what your error message said exactly, but perhaps the restaurant themselves placed an upper limit on delivery orders because they don't like that they are missing out on the tip for large orders. This is purely speculation by me of course.
Some of the fancier places will easily be over $25 of food so if you order for two, $50 is not difficult to reach.
Out of curiosity had you ordered from DoorDash multiple times before you attempted that group order?
I did order before. I thought it may have been some kind of fraud detection but I’d ordered from them multiple times to the same address. In fact, one of the first times I ordered they double billed me. Took a week or so to straighten that out with support. But even if it was some kind of fraud prevention flag it would have been nice to get stopped at that amount while ordering.
Some of the fancier places will easily be over $25 of food so if you order for two, $50 is not difficult to reach.
Out of curiosity had you ordered from DoorDash multiple times before you attempted that group order?