It stopped receiving security updates in October 2017, which means it's less secure than more recent versions of Office.
I've never seen any examples of that. It just makes sense to use vulnerable software that receives security updates. That's why it's not a good idea to use XP, Vista, Windows 7, or unsupported versions of Office.
Most of my software is old, except for WPS Office, the latest Comodo Firewall, and now Win 10. I use it, including an over decade old version of Adobe Photoshop, because it works and I know how to use it. I've also got a second laptop still running Vista. With good security, I'd say it's as safe to use online as any other.
I have Microsoft 365 Home. I treid Google Docs, LibreOffice and SoftMaker Office, and I can say that Softmaker office is a very decent alternative to MS Office and it is cheap and worth the little fee they ask for. They often offer 1 year free.
Softmaker.........forgot to mention them. They're a very good product, at least the last time I tried them a couple of years ago. I would rate them above LibreOffice and certainly way above Google Docs.
But they should really work on marketing, for starters, they still call it Free Office 2018. That makes it sound, that it is obsolete, even though it was last updated on November 2020.
