They hurt more than competitors. If anyone from gmail is reading and gives a crap about the collateral damage from policies like these, they have set me back at least a few months in my attempts to adopt a child. The agency my wife and I had been getting licensed through dropped us, citing lack of responsiveness in completing paperwork. But I've been e-mailing them for months with questions clarifying how to fill out unclear forms and they've been ignoring me. I presented them with a history of all the sent e-mails they never answered, and even gave my e-mail address in person last time I was there, asking them to add me to an allow-list, but it didn't make any difference.
It's particularly disappointing because even just getting the process started was delayed when no one answered our initial inquiries of interest for nearly a month. That was when I first figured out it was because my e-mails were getting routed to the agencies' spam folders. At this point, I'm probably just going to have to give in and get a gmail address for the sole purpose of completing an adoption, and then stop using it and go back to my real address.
Who'd have thought this would be the thing preventing me from completely de-googling?