I don't use my ISP box wifi, bought my own router that lets me use an open source firmware. Not necessarily for privacy, moreso for features I needed. But it's a bonus I guess.
https://openwrt.org
I use mikrotik router/switches and openwrt on glinet devices for wifi APs.
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Mikrotik is good. Said server room was for a wireless ISP and we ran their devices on towers all over the place.
You do know where your extra money went for sure.
