Since HeroLab was PC only and didn't support 5e until last year, I honestly forgot about it. Also, I haven't encountered anyone that uses it in the past few years of playing, so it wasn't top of mind. I suspect a lot of these are going to be local peaks of people playing together. For instance, my groups are either 100% DiceCloud or DiceCloud and Fight Club. Others in the past have been completely Roll20. I think that's going to be common.
I did include an "other" option to catch these, because I'm sure I have forgotten about several.