The answer is as others have stated appl not supporting the open standard RCS.

I will elaborate with apple are deliberately dragging their feet supporting standards as a deliberate attempt to put social pressure on you to buy an iphone.

an audience member asked Apple CEO Tim Cook for some tech support. “I can’t send my mom certain videos,” he said; she used an Android device, which means she can’t access Apple’s iMessage. Cook’s now-infamous response: “Buy your mom an iPhone.”

The Apple Antitrust Case and the ‘Stigma’ of the Green Bubble

The solutions others have suggested of installing other messaging apps like signal will work but I will suggest another; Buy your wife an Android.

You can think of this as a boycott of Israeli VPN end points so it’s directing cash flow away from Israel by dual action of reducing demand for Israeli VPS/ISP services and forcing Israeli file sharers to spend their money on external VPNs instead of in the local economy.

wingdings

Rufus

Best printer 20XX: just buy this Brother laser printer everyone has, it’s fine

Web devs don’t make the pages Firefox friendly? Since the user base is smaller, they just don’t care?

correct

also in the case of Google controlled websites the errors are often deliberately introduced to sabotage firefox