Are you even sure that the Freeview app works the way you're expecting? By that I mean that you're expecting it to be a direct replacement for an aerial connection. I don't believe that it is.
Unless someone can show otherwise, I think that the Samsung Freeview App is (or was) simply a collection "in a bucket" of all the the various on demand apps spread across the Freeview channels. On Demand isn't the same as live Freeview. It's each channel's pick of say the previous week's most popular shows.
UKTV Play does something similar.
TVPlayer claims to offer access to the Freeview channels, but to get to it you'll need to put in your credit card details to create an account. They say some content is free to access and other stuff is behind the paywall.
iBox is the closest I have seen to offering what looks like a full Freeview service via the web. However, they are direct in saying that it's all subscription paid; nothing is free. (Read the user reviews for iBox on Amazon. There's a lot that are not very complimentary.)
The bottom line here is that they're all businesses repackaging the content that's available to stream through individual apps, and then in some cases supplementing that with live feed programming...... but they all want to make a profit. They're businesses not charities. They have wages and costs to pay and there are only two ways that those costs can be covered; they're either selling more advertising on top of the adverts already carried by the commercial channels or they get money from subscribers.
You're looking for an easy way to fix the "I have no convenient aerial connection" problem, and TV via the web seems like a simple and quick fix, but it comes with a bunch hidden of catches. You might actually be better off looking at some way to get an aerial feed to that TV, whether that's by running a decent mini coax* around the edge of the room or having an aerial installer provide a proper feed to the point.
* mini coax: don't use an aerial extension kit
such as this from the likes of Argos, B&Q or the online retailers. They're junk. Complete rubbish. They will cause you headaches with lost signal and interference because the cable is very lossy (signal reduction) and poorly shielded (prone to interruptions from RF noise from lots of external sources).
For a better-shielded and less-lossy alternative get yourself some Sky-type thin shotgun twin cable (WF65 / CT63). It's a Siamese-style cable which means there are two runs of it joined along it's length to make double cable run. However, it can be split into two by carefully slicing the web join. This type of cable is thinner than regular TV coax. It's around 4mm compared to 6.5mm. That doesn't sound like much but it's a big difference when you're trying to conceal some around the edges of a room. WF65 or an equivalent twin satellite cable is about the same thickness (or thinness if you prefer) as those crappy aerial extension kits, but a far better cable, so you're losing nothing in the ability to hide it and gaining everything in quality.
Since the primary use is for satellite installations there's plenty of this stuff sold on eBay as Sky and Sky-Q extension kits. The plugs ends supplied with many are simply a screw-on fitting and easy to remove. Tool stores such as Screwfix and Tool Station sell coax plugs so you can make up your own extension lead.
