Sure, here are my small list personal list of gripes, mostly minor except the first one.
Their continued stance on loot boxes and enabling of gambling.
They did try to do a paid mod system back in the day and got shutdown by gamers pretty quick.
Their initial discontinuation of batteries and LCD screens for their steam deck after only four years.
Their continued stance that they are selling revokable, non-transferable licenses and not games that you own.
Steam's a great company and overall very pro-consumer company in my opinion, more so than most of the other companies in the PC gaming realm but I'll criticize Steam when I see something I believe is anti-consumer regardless of my like for them because end of they day they're still just a corporation that prioritizes profits over people and it's just one death away from being enshitified like the rest of them.