This is a consequence of the Citizens United case, and the ruling was that independent advocacy groups can raise donations of any size, striking the $5000 limits but the disclosure requirements stand, and, in a separate ruling, the contribution limit remains for party organizations
The Republican National Committee is promising an appeal of the latter ruling.
It is not an unalloyed bad day for campaign finance reform, but on a scale of 1-10, I’d give it a 3-4.