A general warning from someone who spent some time teaching:
Even assuming the product of souce services is of reasonably high quality (and that is quite an assumption), the likelihood that the person actually writing the work will match the buyer's style well enough to pass even a cursory inspection is small.
Most educational facilities consider turning in an essay from such a service plagerism and cheating and such action can (once out of public school) lead to expulsion.
There are services that will provide proofreading (cheaper) or editing (more expensive) support for one's writing, but these focus on polishing the presentation of an already 'complete' work.
There are also services that offer research assistance (typically literature searches) which can be invaluble as a time saver.
In some cases the service simply uses better search engines / databases that commonly available; in others an actual human vettes the search results before passing on a pruned list. [Beware of cheap actors here: for someone to be able to scan the abstracts of a search for those likely relevant to one's topic, that person needs considerable familiarity with the field – this does not come cheap.]
These latter two forms of writing support are (generally) considered academically acceptable.
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.