If you are starting out in a new business venture, the answer is no you shouldn’t. Spending a couple of hundred pounds on a logo shouldn’t break the bank. A professionally designed logo is essential for your brand or business going forward as it is the first thing a potential customer will see.
Also, Google is very powerful now and is capable of detecting if the logo you have downloaded is original or not through a reverse image search. In addition, if you have just copied it from the web, there is a chance that you have plagiarised someone and this could result in a lawsuit. You don’t think this could happen, but trust me, it does a lot.
Places like Fiverr are ok and fairly cheap but you do not know these people and it is risky where they get their graphical assets from.
As the old saying goes, “you get what you pay for”, and in this case, it’s true.