And does he have such an easy time everywhere -

No, Liatsi's high end of the bell curve. A lot of people seem to be assuming that if he is offering nice things he must be planning to betray them somehow - use the dots as military emplacements or encourage their citizens to treason or encourage reliance only to loot them and flee - and others are assuming that if he's offering nice things he could be offering nicer things and can be talked into coughing them up one way or another.

Understandable. 

It probably won't help to observe that he could trivially conquer this entire planet, Cefax slightly less trivially but really not very much, and subterfuge and sabotage would be totally unnecessary. 

Nope, nobody will find that particularly reassuring.

He can make them indestructible, if they'd find that reassuring. Side effects include death and more importantly inability to have children.

The ones who need reassurance are not prepared to die on his say-so, thanks.

If they would want that if it was in fact the deal he promised, he is happy to complete the conditional for them. 

(People who just want more stuff can mostly have more stuff.)

(This will inspire their neighbors to want more stuff.)

What a good occasion for dramatic demonstrations of how useful it is for your country to have summoning. Perhaps everyone else will decide that it's useful enough to tolerate dots.

That does help, in fact!

Oh good. Summoning is terribly useful, yes he'll have a demon make you a ridiculous gilded monstrosity of a palace, yes he'll probably have a demon dam your river but he should send someone the calculations first, yes an angel can turn all that desert into something else but it might not last, because of rain patterns...

The ridiculous gilded monstrosity is... very. But when the gaudy architecture starts going up people who thought he was talking out of his ass begin to think that might not actually be the applicable orifice.

He will be delighted to provide any demonstrations that might persuade anyone to have some dots.

He can eventually get most people to have dots. There is one little country with no godsprings in some undesirable mountain territory which thinks magic in general is an evil trap and most people in that country over the age of four react to his overtures (including attempts to explain that some things on offer are not magic) by screaming at the top of their lungs until he leaves, that one he can't get anywhere with.

Well. Trying for universal coverage is not the best use of resources - it's been ten years for Singularity's team of Fëanors, they think they might have a way to leap for new worlds, though they don't yet have a way to come back -

Dots are installed. Does Liatsi have a ceremony in mind?

She does. Also, she doesn't know what daeva normally wear but there is a loose dress code she'd like adhered to for the particular event even though she understands it won't work generally. The entire thing is very neatly arranged to accommodate Cefaxi sensibilities. She will be trading a local art object for a demonic fireworks display to open the dots.

Cam want to play along?

"Uh, I would, but my summoner is a child in Singularity a lightleaper trip away and the Sanity Valar aren't doing Singularity yet."

"Ugh. Do you know anyone who definitely would?"

"Not personally but I could find someone who's really into fireworks?"

"Maybe Minor can polyjuice himself older than fourteen. And Cefaxi-looking, for that matter."

"I feel like it might be a questionable choice to set the precedent of daeva without wings, we overwhelmingly do have them."

"I don't know what happens if you try to Polyjuice into someone with wings. You might get them."

"I guess he could impersonate another demon. I'm not confident in my ability to pick one who looks Cefaxi."

"I guess they can get used to non-Cefaxi looking people."