>your data is more valuable if marketers can assign your real name to your data. or aggregating all data about you, phone number helps with that.

This is mostly a red herring because most of the places that require SMS TOP already have your full name/address (eg. financial institutions, healthcare providers) or are in a position to intercept communications that they can infer that information (eg. google). If apps/sites like tiktok wants my phone number for 2fa, they can fuck off, or get a burner number.