My point still stands.

The developer is registered in Latvia. Yes, it had at one point connection to Russia, so what? A lot of software was developed in Russia. Nginx, for example, that does not prevent millions of websites from using it.

Users leaving OnlyOffice is mostly about enterprise edition (paid) users. In fact, many of them left enterprise version for the Foss version.

The comment above is wrong. OnlyOffice is available under both Foss (Community Edition) and proprietary (Enterprise Edition) licenses. The proprietary version is paid and offers some additional features like extended support.

OnlyOffice is open source and Latvia based.