I'm automatically wary of any link that includes words like "Millions of Mac users rush to get . . . ". Such ads are designed to make readers think that they're missing out on something if they don't take up the offer.
Similar ads say things like
"Everyone over 50 needs to know . . .",
"Everyone who owns a PC ought to know about this free tip . . ." and "Why thousands of people are missing out on . . ."
and so on.
Most often people reach such pages by clicking on a link to Taboola.com. (Those links often appear on, for example, newspaper websites). Taboola itself isn't necessarily dodgy as it's simply a site which pushes advertising material on behalf of its clients. However it seems to attract numerous scammers (or simply companies making incredibly exaggerated claims for their products and services) as it offers a cheap way to advertise to large numbers of people and doesn't seem to care at all about whether or not the products and services being marketed are actually any good. (I've looked at hundreds of such ads being pushed by Taboola and I've yet to find a single one that I'd trust!)
The free version of TotalAV is an anti-virus program. It's a 'scan on demand' tool only though, rather than one which constantly 'works in the background'. It's safe enough but you don't really need it.
If you do install the free version of TotalAV, you'll then be encouraged to buy TotalAV Essential Antivirus for $19.95 in order to get protection which 'runs in the background'. However, if you read the small print, you'll find out that that only covers a licence for the first year. It's a whopping $99.95 after that! Further, it's not a particularly highly-rated anti-virus product anyway, scoring just 2 out of 5 on the PC Mag website because of failing such as its poor anti-malware protection.
https://uk.pcmag.com/antivirus/118394/totalav-essential-antivirus