Does this directive negatively affect memes or Gifs?
Quite the contrary.
The directive as agreed has specific provisions which oblige member states to protect the free uploading and sharing of works for the purposes of quotation, criticism, review, caricature, parody or pastiche. Most obviously this will ensure that memes and Gifs will continue to be available. The provisions actually ensure that they will be even safer than before because previously protection for such works was afforded by different national laws.
Will it still be possible to see a snippet when reading or sharing articles on news aggregators?
Yes.
The agreement will allow news aggregators to continue to display snippets without requiring an authorisation from the press publishers. This will be possible provided the snippet is a “very short extract” or “individual words” and that the news aggregator is not considered to be abusing this facility.
This directive will kill-off start-ups...
No.
The deal offers specific protection to start-up platforms. Platforms which are younger than 3 years old, having an annual turnover lower than EUR 10 million, and average monthly unique visitors lower than 5 million, will be subject to much lighter obligations than the large, established ones.
There are claims that Article 13 could lead to work being taken down when the rights holder is unknown. The example of the hit Despacito was given...
The aim of the draft Article 13 is to give artists a stronger position in invoking their rights for fair compensation when their work is used and distributed online by others. An artist will typically have notified platforms like You Tube that a specific work is theirs. Works for which the rights holder is unknown are therefore unlikely to engage a platform's liability if they are uploaded there.