Its really easy to sign up for a Google account for stuff like this, and I have multiple accounts on gmail anyways in case I dont want to share my important personal email.
Agreed, but -- Ironically, one of the reasons I don't want to share my contacts is that I did use the Google Account I use for commercial tryouts... so there'd be no value in Notion.so having access to the contacts, let alone spamming me with any potential "helpful" tips or contacts or recommendations based on such contacts :P