Great answer here.
I'll add this history: CISCO
systems was founded by a married couple. Both from Stanford university, he wanted to send messages to his wife, on the local network. So he invented
this device called a router
, so his message reach her.
When CISCO grew like crazy, he -openly said- wasn't manageable material. He was a researcher and that was it. She wanted to run the company her way, however she started clashing with the management the investors put in place. In the end, the board of directors took her out of any position within the company. she felt betrayed. Investor told her, don't take it personally, however she did. She sold her stocks, even against the suggestion of the investors who bet on the company initially. It is rumoured that that sold operation got her around 400$ million, however had she taken investor advice and not feeling the stock, those stock were worth billions, with a b.
So, as it was said here, bringing investor is bringing sharks to you company. The challenging is converting them to be your sharks, or be clear that at some point the founder will loose control.
another good example is Alphabet (aka Google), Larry Page (one of it's founder) wasn't CEO material initially. He had to wait for that, and he with Brin (the other founder) had to look out for another CEO for Google. You can see it as losing control, but they plated the game until Page was able to show up he was ready for the job.
Best of lucks!