Yes, I have seen those things - it tells me a lot of which the ethical and likely-to-be-know-what-they-are-doing ones are, and which are run by a bunch of amateurs in way over their heads.

Ethics are ethics - they don't change in the cryptocurrency world. The only reason for a founder of a company to try to pump the value of a coin (or stock) beyond it's actual legitimate market value is to take advantage of stupid people.  A company founder should promote their product and market their company - but the market then determines the actual value.  They should NOT try to influence that.  An ICO is no different than an IPO in terms of underlying principles - the method is different, but the underlying ethical principles are the same.