Terror Spam advertising

you should check to make sure your computer isn't infected with some kind of malware or adware that could be sticking their own ads on websites.

That's gonna be on your end mate. Whitelisting this page for more than a 5 years now without any issues.

All i got is tiny banner on a main page. I think your computer is infected by adware, i recommend to use decent antivirus tool, Malwarebytes for instance.

It happens to me from time to time. In general, going back of one or two pages by using the browser's back button brings me back to the Steamgifts page (and often with another ad that is not posing this problem).

If I'm not mistaken, these dubious ads are just badly chosen by Google, and Google's choices of ads depend on your country / region, your browsing habits, your searches on Google, ... If you have an account on a Google site (gmail, youtube, google search, ...) you can try to depersonalize these choices of ads by going here in order to make the problem less frequent. But I think it will only work if you are usually logged into a Google account with the browser used for Steamgifts. There is also a form to report the bad advertisings somewhere on this Google site, but I do not think it's really effective.

The only other solution I see is the use of ad blocker (like uBlock Origin) for the time that this problem of annoying bad ads will last.

Edit:
An other solution is to become a patreon (starting at $3 per month) to remove ads while keeping your support for Steamgifts... ^^

Using classic combo of noscript and adblock+, ive never seen an ad here for 3 years.

Ad Blocker Plus and MalWareBytes Browser Guard.
Blocks most annoying ads for me, across the Web.
And TBH, MWB:BG blocks far more ads,trackers, PuPs and other crap than ABP does. And it's also free.
(MalWareBytes Browser Guard is not part of the MalWareBytes standard SW, you do need to install the extension in your browser, only available for Chrome and Firefox right now, it seems.)
https://www.malwarebytes.com/browserguard/

CG is creating SteamGifts | Patreon
https://www.patreon.com/steamgifts

If you become a patron, the ads will disappear.
Is it a patron but advertising?
Your computer will be contaminated.
I think so.

There was another thread about it a couple months ago from someone who had a similar problem but personally SG is whitelisted and I've never had a problem.
The only adds I see is a small one at the bottom of the page.

adbocker, i have yet to see a single advert on steam gifts since they had the harmful popup ads. had steamgifts on my adblock whitelist until that

It sounds like your web browser is hijacked. I'd recommend doing a scan with Malwarebytes to see if it detects anything.

You can get the free version here.
https://www.malwarebytes.com/mwb-download/

Just patreon CG and ads are gone. :)

AdwCleaner is pretty good at cleaning up bad ad stuff.
Be prepared to restart your PC afterwards though.