And unlike most „forbidden characters“ for file names, the colon is actually used in NTFS: to separate the file path from the name of a named fork Alternate Data Stream.

Well, that depends on the PC. Upgrading a laptop is quite hard (with exceptions). And with RAMageddon, a „real“ desktop may be prohibitively expensive. In Germany, where I am, a PS5 Digital Edition is 599,99€ (including VAT), while a good PC would probably be at least 1300€. But OP, if you can afford it, I‘d still recommend the PC for its versatility. You can do anything with that. Put SteamOS on it, its like a console. One button press, you‘re on a full desktop you can use for work, education, social media, etc. p.p.

Try deleting storage for all Reddit domains, that fixes it for a bit.