For some reason I get “You do not have permission to view this page”.
That's a premium membership forum - it's only able to be viewed by people who have membership.
There was a problem some time back where people who paid for the forum subscription were seeing ads, and one of the membership perks is an ad free browsing experience.
That problem was corrected, but the issue only pertained to subscription members because only we have ad free browsing here. People without a membership see ads.
The ads your seeing do seem invasive - it's very likely that it's whatever advertisement company is providing the ads.
You can always reach out and find out what the membership fees are and pay that fee, or use an ad blocker though the use of one might be against forum rules.
If neither of those options works for you reaching out to the administration staff and opening a ticket would be your best course of action because invasive advertising does detract from the forum experience.
A member gifted me a lifetime membership to this site so I could take advantage of the perks that come with membership, perhaps someone of more means would do the same for you? My gift was completely anonymous.
You never know... I'll pray for you.