If you don't mind, can you expound more on what your incident was? I'm personally a user of eToro, which I think is an example of what kind of broker you've described. I knew eToro isn't as "safe" compared to brokers such as Fidelity and Schwab, but being non-US my choices are really limited.
Long time ago I had a retirement account at some sketchy outfit. The name escapes me now, I think it had big words in it like "financial group" but I'm quite certain it was a strip mall storefront at best. Predictably it went out of business, I had to deal with SIPC, and it happened a few years after I had already quit the job so the employer refused to help at all.
Long story short, it took four years to get about 90% of my money back, mostly because I didn't have the statements after quitting - most recent 2-3 years or so - and the data that SIPC had didn't match what I thought I was owed.