Looks fantastic! As someone who has done it before, if this gets popular you'll run into some abusive users that you'll want to deal with. Microsoft will often give out free access to it's PhotoDNA service for detection of explicit images of minors. VirusTotal will often do the same for malware in exchange for samples. You'll also want to have a structured retention process, e.g. size is inversely proportional to storage time.
Good luck, get in contact (see my profile) if you run into any issues.
I don't know if it's cultural, but as someone of the 'current generation' (Gen Z), I feel that the opposite is true and typing speeds increase as you get younger (to some limit).
I've tried to back this up and only found a single, questionable, data source[0] on the topic but I do attend several typing competitions and some of the young ages are phenomenal. I was beaten a few months ago by a 15 year old who was typing >220wpm+ for 5 minutes.