(a) Citi lets you opt out [1]
(b) Privacy.com still shares data that they don't deem "personally identifiable" [2]
(c) Privacy.com may share your data during a merger/sale of company stock etc. and I don't think they limit what can happen to it [2]
(d) Privacy.com may share your data "with financial institutions, processors, payment card associations and other entities that are involved in the payment process" (notice they don't limit the usage to actually processing your payment, or the storage to the duration of your membership... they just say "we may retain data about you for a period of time consistent with applicable law" which I assume could be quite a while)
(e) I'm not sure why I should trust a company named privacy.com themselves with my unique device IDs and location data, whatever the situation with third parties is.
[1] https://www.citicards.com/cards/wv/JRS/ACQ/img/Generic_AO_ve...