Investment advisors are different than financial advisors. They quack the same but are different ducks. Investment advisors give advice, for a charge , and do not handle your money and that is where one should go for advice, not some financial advisor who wants your money
In the US. You can not advise for any compensation about securities if you are not an RIA (Registered Investment Advisor) or an IAR (Investment Advisor Representative) under an RIA. With an RIA affiliation, you are under both the Best Interest rules and act legally as a fiduciary to the client. To be under an RIA you have to pass Series 65 (unless CPA or CFP, etc). If you are a CFP, you have to "act" as if a fiduciary, even if you are not legally one. There is a huge amount of disclosure required, primarily through Form ADV and the firm brochure (Form ADV part 2). RIAs must disclose information about their business practices, fees, conflicts of interest, disciplinary history, cybersecurity measures, and how they handle client information, including their privacy policy and business interruption policies. You have to pay fees to the SEC or State, depending on size, required education etc etc etc. Very highly regulated.
A "broker, technically a securities representative, can not give investment advice; can only sell products. Has to follow the same Best Interest rules and client suitability with lots of fees to FINRA, every state licensed in, required annual extensive education requirements, and has required expensive E&O insurance at least by most broker-dealers (under which a broker has to be licensed). Huge disclosure requirements, especially under Best Interest rules (Elizabeth Warren got passed since she thinks they are all crooks). For example, if you open a simple IRA account, you may have 72 pages of required disclosure. "Best Interest" is not as legally high as fiduciary, but it is close. FINRA is constantly auditing broker-dealers and heavily fines for minor paperwork issues, especially to be sure every rep is documenting in detail how their recommendations were in the best interest of the client based on their suitability, goals, risk tolerance, and financial condition (income, assets, holding period, prior investment experience etc etc.
Additionally, any actions taken by the representative on public media must be approved by compliance, including websites and approved social media platforms. All emails have to be routed via the B/D server using an approved email account and retained. No messaging services can be used unless allowed by the B/D and archived. This is an area where many of the large broker-dealers you are familiar with have received substantial fines for representatives using text messages in violation of FINRA rules.
Insurance agents have no obligation but, of course, can only sell insurance. For variable or indexed annuities, they must also hold a securities license and be subject to the broker's rules. Some State insurance commissioners have best-interest rules, but insurance representatives are only state-regulated for insurance licenses, compared to securities, which are both federally and state-regulated. Most states follow federal rules but conduct separate audits of RIAs, IARs, Brokers/dealers, and representatives. Additionally, states may audit individuals more frequently than the Federal Government (FINRA or SEC) for securities-related matters. However, it is easy to file a customer complaint with securities via FINRA and all hell can come to you by FINRA in arbitration hearings etc.