Unfortunately, there are many plastic toothbrushes that are lasting lifetimes in our landfills. Once I learned that, I switched to eco-friendly ones. There just isn't a need for a smart/ai toothbrush, IMO.
Guy was originally gender neutral as it was used to call someone stupidly bold (iirc). The term was most often used toward a single gender that was known for being stupidly bold and became synonymous with that gender. That's how it became gendered.
Boost dev was how I even found out about lemmy. So I actually followed the app.