There’s supposed to be some non-random hand smoothing going on MTGA.
I believe this only applies in best of 1 matches, but not best of three matches.
Unfortunately I don't have a credible source for this.
Card advantage is massive in MTGA so people don't mulligan when they should ...
It's bad enough that my friend group casually accepts having to "concede" 2 or 3 times just to get a decent match going.