Mine is SiriusXM. When I feel like I want to con them out of trials with multiple accounts (because they don’t really keep account information for too long), I have to go to their website because their app is essentially useless unless you’re subscribed. But their website is awful because of not design alone but function. Their lookup tool for license plate, VIN or radio ID never works so it’s pointless to try. They don’t make it apparent that you can select the stream access, they make you have to waste time before you figure that out.
And their tech support? Awful.
Anything SharePoint.
So many companies end up using SharePoint for “knowledge management” not realizing they are dooming their knowledge to be lost in some byzantine hole of information where no one will ever be able to find or use it ever again. Worse, as more knowledge is yeeted into the pile, the search becomes better and better at presenting outdated, or irrelevant information. So, you will have new employees who find a process which is 5-10 years out of date, completely wrong, but it looks official and the links still work for some gods forsake reason. Of course, the right information is in SharePoint somewhere, but it’s probably locked behind a site with broken permissions, in a document library in a Word document which isn’t properly indexed and there’s 4 different versions of the same document with names like “New procedure_v3_DRAFT_bob’s edits.docx”, because no one understands how file versioning works.