Somebody else mentioned this to me, and now there is an article about it as well that might explain part of it, but not all. There is an empty space at the corner of Prospect and Webster Ave which is a new build yet empty for a while now...

I wonder, what is the selling point of new mixed-used space if it is really empty or useless? Is this what some urban planners and zoning activists mean by "Churn"?

"Cambridge is not exempt, and dark stores have come. Fridge No More opened last year at 1036 Cambridge St., Wellington-Harrington, replacing AdoEma Realty, and was serving the eastern half of Cambridge and parts of Somerville. Then, three weeks ago, Fridge No More abruptly closed its doors after burning through its funds." ... "As part of an effort to better understand the possible impacts of dark stores in Cambridge, we at the small-business advocacy group Cambridge Local First gathered testimony from members. Local business owners pointed to two primary concerns: increasing concentrated market power and declining quality of experience of residents and visitors in urban centers." https://www.cambridgeday.com/2022/04/03/dark-stores-are-coming-to-deaden-our-streets-giant-businesses-that-shrink-the-community/