The CRA has public records of JW congregations and other entities, and having just checked the website, there are over 700 JW entities with revoked charitable status (either voluntary, failure to file, audited, annulled, or "other") out of almost 1900 listed.
22 were "failure to file" a tax return; these span decades from the 1980s until 2022.
The remainder of revocations were deemed "voluntary", spanning 1995 until September 2024. Some reasons for a voluntary revocation would include such things as amalgamation or dissolution of individual charitable entities.
If you look at individual JW "charities", you can see the "qualified donees" (recipients of donations) - the one I looked at had ONLY $426 going to Georgetown (I initially typed "Gorgetown", which seemed apt) and a second recipient (a local Congregation™) received $5321 for the fiscal year September 1, 2022 to August 31, 2023.