3 had a terrible roster of stings that featured a comedian (Spencer something IIRC) delivering a little bit of observation on a makeshift stage to lukewarm canned laughter. They got very tiresome very quickly and were eventually replaced with a very simple white screen that said "3 - Sponsors Original Comedy".
The Fosters ones aren't the worst but they are tiring. Sometimes they don't consider just how often they're played out, considering Channel 4 is probably the biggest comedy channel on terrestrial television.
The Fosters "money never sleeps" bumper must have been used for at least nine months, I am absolutely sick of the sight of it. The best thing about Catastrophe is that C4 consider it a drama and they don't sponsor it.
As you say, the 3 ones were fantastically bad, the comedian was Spencer Jones who is a regular on the circuit and was in Upstart Crow last year (as the character who was a parody of Ricky Gervais). It was terrible observational comedy that was always going to look ridiculous next to proper comedy, and as you say they seemed to abandon it quite quickly without any proper bumpers to replace them, just the logo on a blank screen. Grolsch used to sponsor C4 comedy as well for a while.
Twenty years ago Cockburns Port used to sponsor all ITV's comedy, including the Comedy Awards and the Audiences Withs and anything else that came up. That also included the first series of Cold Feet but it was an appalling match, it was some Marquess of Bath-style comedy posh bloke causing chaos in a stateley home, which looked ridiculous alongside the modern and subtle comedy of Cold Feet. Around the same time of course Becks sponsored all of C4's drama but after a few weeks of Queer as Folk they decided it was getting too explicit and withdrew it, to general derision.
This happens in Talksport football commentaries over here - there'll be a 20-second long promo read out for a sponsor. There's an occasional variant on LBC where there'll be a promo for a sponsored show which is read from a script (the only time I've heard it is when James O'Brien does it and it's obvious he's reading it from a script and not putting effort in.)
Yes, Absolute used to do that when they had Premier League coverage until last season, and when Barry Davies did a couple of matches for them last season, it sounded very odd him reading out the Sky Sports promos.
And, of course, "Welcome to Bologna with Capital Gold for San Marino vs England, brought to you in association with Tennants Pilsner, brewed with Czechsolvakian yeast for that extra Pilsner taste, and England are one down!"