[Leonatus]

I'm having a recipe for the german journal "Tagespost", it's this one:

#!/usr/bin/env python
# vim:fileencoding=utf-8
from __future__ import unicode_literals, division, absolute_import, print_function
__license__ = 'GPL v3'
__copyright__ = '2020, Pat Stapleton <pat.stapleton at gmail.com>'
'''
Recipe for Die Tagespost
'''
from calibre.web.feeds.news import BasicNewsRecipe


class AdvancedUserRecipe1589629735(BasicNewsRecipe):
    title          = 'Tagespost'
    language       = 'de'
    __author__     = 'Pat Stapleton'
    description = ('Die Tagespost trägt den Untertitel Wochenzeitung für Politik, Gesellschaft'
        ' und Kultur und ist eine überregionale, wöchentlich im Johann Wilhelm Naumann Verlag in Würzburg erscheinende Zeitung.')
    oldest_article = 7
    max_articles_per_feed = 100
    auto_cleanup   = True
    use_embedded_content = False

    feeds          = [
        ('Tagespost', 'https://www.die-tagespost.de/storage/rss/rss/die-tagespost-komplett.xml'),
    ]
    extra_css = 'td.textb {font-size: medium;} * { text-align: justify !important; text-decoration: none !important}'
    remove_attributes = ['href']

calibre_most_common_ua = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.87 Safari/537.36'

Everything works well, so far. But when I began to make use of it, some two years ago, there were lots of images downloaded, too. In the current of time, the images became fewer, eventually there has been downloaded only one image, and now, for a few months, none at all.
I'm quite satisfied with the recipe, so my remark is more a question out of interest than a request for support: Are there technical reasons for this behaviour, or am I doing something wrong? - In the current of time, I admit, the content of the journal has considerably augmented: from about 100 pages (on my e-reader) up to 200 and more.