why remove mariadb?

why remove mariadb?

root@app-server[10.10.10.83] ~ # apt-get autoremove             
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  default-mysql-server dh-python emacs24-nox g++-6 galera-3 libaio1 libbabeltrace-ctf1 libbind9-140 libblas-common libboost-filesystem1.62.0 libboost-iostreams1.62.0 libboost-system1.62.0 libconfig-inifiles-perl libdbd-mysql-perl
  libdbi-perl libdbus-glib-1-2 libdns162 libevent-2.0-5 libgfortran3 libgmime-2.6-0 libisc160 libisccc140 libisccfg140 libjemalloc1 libjs-angularjs libjs-lodash liblwres141 libmagickcore-6.q16-3 libmagickwand-6.q16-3 libnotmuch4
  libperl5.24 libpython3.5 libpython3.5-minimal libpython3.5-stdlib libreadline5 libsnappy1v5 libstdc++-6-dev libtalloc2 libterm-readkey-perl libunbound2 libwebpmux2 libxerces-c3.1 libxml-security-c17v5 mariadb-client-10.3
  mariadb-client-core-10.3 mariadb-server-10.3 mariadb-server-core-10.3 php7.0-dev python-gpgme python-idna python-oauth python-pyasn1 python-zope.interface python3-crypto python3-tz python3.5 python3.5-minimal rename sgml-base socat
  tcpd xml-core
0 upgraded, 0 newly installed, 62 to remove and 0 not upgraded.
After this operation, 292 MB disk space will be freed.
Do you want to continue? [Y/n] n
Abort.
root@app-server[10.10.10.83] ~ # aptitude why mariadb-server-10.3
i   rsyslog              Suggests rsyslog-mysql | rsyslog-pgsql
p   rsyslog-mysql        Suggests default-mysql-server | virtual-mysql-server
idA default-mysql-server Depends  mariadb-server-10.3
root@app-server[10.10.10.83] ~ #