Other than advertising, what are their profitable sectors?

One could rephrase.

Other than making beeeelions of dollars each year by totally dominating the global advertising market, what else do they do?
Hey, maybe that's enough.

At that level of penetration, even additional intrusive regulation is usually a positive.
It's harder for smaller incumbents to follow new tighter rules than it is for the fat monopolist.
The banks are the best recent example of this effect.
Even forced breakups are usually good for shareholders.

They're making about $5 a share at the moment, give or take.
Down a fair bit from recent peaks.
On trend, it was about $1 a share seven years ago.
5^(1/7)= 25.8%/year compounded.
That isn't a prediction, but it's the reason many of us are impressed.

I'm fine if they blow 10% of owner earnings on lottery tickets that usually fail. Or always fail.

Jim