No problem. In short, TiZ used firedrop as it's only filehost. Firedrop had caught flack over the years for some of the content uploaded by the TiZ community (TiZ always complied with DMCA's, and it hadn't hosted first party Nintendo content for quite a while). While they could've continued to use Firedrop and keep the downloads going they were mindful of the pressure that Firedrop had been subjected to and as a courtesy decided to part ways with them (continuing to host with them may have culminated with Firedrop going out of business). As this was coinciding with TiZ owner, Jambo, stepping down from running the site it was deemed a good idea to essentially 'start afresh'. Jambo's 'stepping down' statement (from 2 months ago) coincided with the unveiling of the 'new' site that had been in the works behind the scenes for a considerable length of time prior to being launched, and the TiZ community has been slowly migrating across over that period and reuploading everything with new file hosts (no longer only using one, but using any host chosen by the uploader... but expressly NOT Firedrop). The promise of the new site is that it will eventually host content that TiZ was unable to.
The timing of TiZ removal of links truly is coincidental to the events surrounding other rom sites. AFAIK it certainly isn't due to any recent direct pressure from Nintendo (although it is possible that Firedrop may have received warnings from Nintendo that haven't been well publicised within the TiZ community that could have led to these events occurring now).
I'd just like to reiterate that this process has been many months in the making. For those of us that are TiZ members, this all happened at the end of June with the removal of downloads being something we all knew was coming at some point in the future.
The OP, and the majority of responses to it, are scaremongering by just presuming this is another takedown by Nintendo, and that all other romsites are likely to follow suit. That's not the case.
This story should've been presented as a story of hope rather than "another one bites the dust".