I asked Revolut support about this directly the other day - is there any info of my accounts they share?
The response was vague, but I did expect that, as these kind of questions are not for regular users. Essentially, they told me they don't report anything and any tax requirements I have in my country are my responsibility.
HOWEVER, this is the info on their site:
"Will Revolut share my tax information with anyone? Revolut has an obligation by law to report the year-end account︀ balances to local tax authorities in Lithuania annually or provide information on their request. Revolut︁ does not share your information on an automated basis or directly with tax authorities of︂ other countries, it is the Lithuanian tax authority that’s responsible for collecting and sending this︃ to other local authorities under the Standard for Automatic Exchange of Financial Account Information, developed︄ by the OECD, which represents the international consensus on automatic exchange of financial account information︅ for tax purposes, on a reciprocal basis."
So, even though customer support was correct to︆ say REVOLUT does not share any info of my account with MY government, they are︇ obligated to share it with THEIR government (Lithuania), and THEIR government (HAS TO?) share that︈ info with MY government under CRS.
So basically, yes, your account info is shared, but︉ there are many moving parts here I don't think anyone but insiders would know. How︊ often is info shared? In what format? How much manpower are looking into this? How︋ well is actually CRS followed in practice, etc...
I have also seen different approaches to︌ CRS. Some report all the ins and outs of accounts, which would amount to a︍ serious burden of information to be shared and controlled. Others report year-end balances (like Revolut),︎ which is cool, but beats the purpose of the surveillance, since you can just make️ your net balance 0 before the reporting date, and have moved millions prior. The third option I've seen is companies using a 30-day moving average of inflows and outflows to report.
This is the most "exact" answer I can give you. Hopefully, others can shine light to this as well.