There's two separate things at play here.

One is "I don't want to use Meta products as a matter of principle", and WhatsApp's a no-go if that's your posture.

The other is "I don't want to drown in horrible, algorithm-curated junk content". Instagram is just as bad as Facebook there, but WhatsApp is definitely not the same.

I'm waiting for Whatsapp to go down the toilet too. I notice it is already advising me to beware of misinformation on forwarded posts and only to use official and trusted sources (the government and their mates basically).