I have a friend, not super close but close enough, who suddenly came into a lot of money. As in, seven-digits wealth. They are overall reasonably sensible with money, and have even expressed an interest in MMM and some of my weird frugal life choices. When I went to Camp Mustache TO last year they grilled me about the presentations, the people, the purpose etc.
So far normal life has continued after this injection of cash, with the only changes being that their mortgage is paid off, they bought back their secondhand car they had previously sold to a friend, they refinanced another friend's debt so they're paying 3% interest instead of 18%. And they incorporated an investing company, based on the fact that in the past they invested in weed stocks and turned $30K in ~$250K. This company will continue with those sorts of investments, but also do angel investing and interesting things like that.
This is where my spidey senses start to tingle. There is a lot of useful investing information out there (MMM, J Collins, nords on angel investing etc), and I would love to recommend those resources and suggest a more conservative approach to managing the money, with say 10-20% as higher risk "play" money. But really it's none of my business, and I'm sure this person is receiving 1001 suggestions for what to do. I'm concerned for them, but also acknowledge they are a pretty sensible adult so they can figure it out. It would suck to invest and lose so much money in risky gambles, but at the same time maybe they just consider it all to be play money because it wasn't earned.
My thought so far is this: send an email saying something along the lines of "These are really good resources on investing, and I follow this advice for my own investments. I know you're probably getting a ton of suggestions from people about your money right now, so I totally get if you don't want any more. But if you ever want to ask me about any of this I'd be happy to talk".
Does that sound reasonable?