How do branding agencies guarantee the patentability of a name/trademark?

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How do branding agencies guarantee the patentability of a name/trademark?
I study this area, and almost every serious office writes that the names undergo a full patentability test, and as I understand it, not from a free database, but a full-fledged search with lists and applications.
But this is impossible if we are talking about a situation where the client is provided with a list of options. You can check one name - and it's well worth it - 15,000 rubles for one option are asked by companies that do all this.
And the agencies also offer a choice: 10 titles, 50 or even more!
That is, the development budget will be less than the verification budget ... Offices say that they have their own person, but this is also nonsense, no one will provide a service worth under 1 million for a conditional 10-20 thousand rubles.
So the offices blatantly lie and just check for free bases, right?

Answer 1

as
you need to know that TM may not be registered,
therefore, about
it's funny how everything they do with Stipanenka
- they break through the bases and say that no one took it

Answer 2

Do not trust any agency, it is better to look and check everything in the contract