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[tenebrisalietum]

... most of them aren't [offering an ad-free experience.]

This is an English language phenomenon called conversational deletion. Examples of it at the beginning of sentences are here: https://learnenglishwithdemi.wordpress.com/2015/07/07/conver...

[leephillips → tenebrisalietum]

No, it’s not, and the examples on the page you link to are examples of something else entirely. The subject here is “some platforms” and is not deleted.

[lelandfe → leephillips]

Although some platforms offer an ad-free experience for their premium users, most don’t.

“Are not” was also a bit awkward at the end. It was still intelligible, though.

[tenebrisalietum → leephillips]

I'm not sure how you can't extrapolate from what I posted and see how conversational deletion can apply to the end of sentences?

[leephillips → tenebrisalietum]

It has nothing to do with where in the sentence the deletion is. It has to do with what is deleted.

“I like spicy food but my girlfriend doesn’t [like spicy food].”

This is correct deletion, at the end.

“I like spicy food but my girlfriend isn’t.”

This is what the illiterates who made the website are doing. It’s not conversational deletion, it’s just wrong.

EDIT: Also, and more to the point, “conversational deletion”, as defined in the link you provided, is the deletion of the subject of the sentence. This is not what is happening here, as I pointed out. Again, nothing to do with whether the deletion is at the beginning or the end.

[tiahura → tenebrisalietum]

The problem is that the deleted verb (offering) isn’t parallelly conjugated to “offer” so it seems awkward.

I would change it to “most of them don’t.”