All Google products get worse over time. Gmail has been getting consistently worse for over a decade.

It's all baked into the economics, both intentional and unintentional.

Intentional. Give users a great, free product and get them to start depending on it. Then start adding features to enhance monetization which usually degrades the product experience.

Unintentional. Great, free product starts developing a life of its own within the company. Engineers add features no one cares about or needs, so the engineers can look productive. Product just gets bloated and bad, but few feedback mechanisms exist to tell that to the company because users have become locked in.