⚡ represents Lightning, which is a network and payment system, not a sat. If over time ⚡ becomes the symbol for sats I'll of course adopt it. But it doesn't make sense to me to use it. That would be like VISA using the US dollar for its logo.
Discussion
⚡️is closer to what’s happening here with zaps
if you’re looking for controversy by using that symbol, then you have found it
sats is the symbol for satoshis