> Also, they require a CLA with copyright assignment so they can reuse your contributions in nonfree software. It’s always shady when companies do this.

They sell a version of the software, of course they'd have a CLA. It's not shady, it's a prerequisite to be able to sell - because even if you assume no contributor will decide to retract their contribution later on, many of your customers will ask for guarantees that you fully own, control and can sell the code you're selling them