In terms of being “safe,” if you mean in terms of data collection/privacy, just because big companies have an interest in Linux, that does not mean your Linux Mint install is sending telemetry back to those big companies with your personal data.
Big companies have an interest in Linux because Linux is the backbone of server infrastructure all over the world. They contribute to the code, but the code is open source, so the community could see if they were putting some kind of telemetry into open source projects, or the community could simply fork the code if a big company tried to do some other objectionable thing.



As someone out of the loop on this, it would be helpful if they didn’t wait until 4 paragraphs into the article to state what OnlyOffice actually did. Likewise the article they link to by OpenOffice doesn’t state what EuroOffice did until 7 paragraphs in.
Apparently it’s a dispute about EuroOffice changing the logo when they forked OnlyOffice?