God a WeChat ban would be absolutely crippling, I can't imagine that has any real traction.
I work in hospitality, and a very large percentage of our guests at all properties globally are Chinese (about 40% of all of the guests at mine). Consequently we support transactions with WeChat, and have always heard from our guests that they appreciate we support the platform and that is a big reason they use us.
Now I am not in the US, but my chain originates there. It would absolutely cripple us if WeChat were banned. I wouldn't put it past the government to try, but I have to think that corporations wouldn't let them.
It's super common like ComradeSalad said, but it works and it makes for super easy PR messaging too. Add some unpopular bill into a totally unrelated one. Oh you want to vote against the Ukraine war? Well, we put it in the same bill as a package for supplies for US military troops, so if you vote against it you will be comitting political suicide.
"Senator Pumpanddump voted against the America Loves Our Troops Act. Does this mean he hates our troops, you decide!"
The practice should be illegal, but so should half the things the US government does.