I did think about this a few years ago and opted for 👍. I feel a little weird when I see the white reacts used by others. This is not so much of a problem anymore but Slack/etc used to not stack the reacts, so if everyone was thumbs-upping you'd have a bunch of different ones instead of just one count and it made voting with 👍👎 more difficult. If nonwhite comrades tell me they prefer the white ones I'll switch but I suspect nobody gives a shit.