But a phone number is expected here where I live (Spain). Few companies seem to respond via email (some do, but it's rare). Everyone just wants you to give them your phone number so, if they decide to call you, they will do a surprise call a few weeks after you applied, at the most inconvenient moment, with no advance notice of any kind.
And since first impressions are important, not being available during that inconveniently-timed surprise screening call is probably a negative point at least on a subconscious level.
I imagine most companies just want followers on LinkedIn.
And years after that, NextDoor did... and even used physical mail to spam people's real neighbors using the "inviting" user's name. Despicable, and even potentially dangerous in these sad times of polarized and unhinged trash.
Oh yeah... NextDoor also exposed people's exact physical addresses to all users by default for a year or two. I mean... that's just inexcusable and deliberate irresponsibility.